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Erica

Questions and answers by visitors named Erica

Questions (399)

Suppose that you follow the size of a population over time. When you plot the size of the population versus time on a semilog
1. 4 answers
2. asked by Erica
3. 1,937 views
Convert 1.01 x 10-8 seconds to nanoseconds
1. 3 answers
2. 2,091 views
A tank holds 52.9 cm3 of water. What is the volume in in3? (2.54 cm=1 in, Remember significant figures, but this answer does not
1. 6 answers
2. 4,733 views
If a particle moves in the xy-plane so that at time t>0 its position vector is (e^(t²), e^(-t³)), then its velocity vector at
1. 4 answers
2. 1,951 views
Which situation is an example of negative acceleration?A. A car moving a constant velocity B. A jogger slowing down at the end
1. 5 answers
2. 88 views
If the integral of (x^2 - 2x + 2)dx from 0 to 6 is approximated by three inscribed rectangles of equal width on the x-axis, then
1. 4 answers
2. 1,048 views
The amount A(t) of a certain item produced in a factory is given byA(t) = 4000 + 48(t - 3) - 4(t - 3)³ where t is the number of
1. 4 answers
2. 2,220 views
The number of bacteria in a culture is increasing according to the law of exponential growth. There are 125 bacteria in the
1. 4 answers
2. 9,683 views
y = x^2y = 6 - x Find the area of the region by integrating (a) with respect to x and (b) with respect to y.
1. 1 answer
2. 472 views
Use differentials to approximate the change in the volume of a cube when the side is decreased from 8 to 7.99 cm. (in cm^3)Thank
1. 4 answers
2. 4,421 views
find the sum of each finite arithmetic series 8+9+10+...+15
1. 3 answers
2. 804 views
One of the five charateristics of living things is being able to reproduce. Do all living things have to have all
1. 3 answers
2. 625 views
The monthly revenue acheived by selling x boxes of candy is calculated to be x(5-0.05x)dollars. The wholesale cost of each box
1. 1 answer
2. 905 views
The surface ares S (in square meters) of a hot air ballon is given by s(r)=4 pi r^2 where r is radius of balloon (in meters). If
1. 1 answer
2. 546 views
the spread of oil leaking from a tanker is in the shape of a circle. If the radius r (in feet) of the spread after t hours is
1. 4 answers
2. 2,143 views
The function f(x)= x^4 is not one-to-one. Find a suitable restriction on the domain of f so that the new function that results
1. 1 answer
2. 636 views
The period T (in seconds) of a simple pendulum is a function of its length l (in feet), given by T(l) = 2pi sq root of l/g,
1. 1 answer
2. 1,304 views
The pH of a chemical solution is given by the formula pH = -log10 [H+] where [H+] is the concentration of hydrogen ions in moles
1. 3 answers
2. 1,756 views
The formula D= 5e ^-0.4h can be used to find the number of milligrams D of a certain drug that is in a patient's bloodstream h
1. 4 answers
2. 7,347 views
A culture of bacteria obeys the law of unlimited growth. If 500 bacteria are present initially and there are 800 after 1 hour,
1. 2 answers
2. 752 views
The logistic growth model p(t)=0.90/1+3.5e^-0.339t relates the proportion of new personal computers sold @ Best Buy that have
1. 3 answers
2. 1,105 views
Solve eacy system of inequalities. If the system has no solution, say that it is inconsistant.x -y -z = 1 2x +3y +z = 2 3x +2y =
1. 1 answer
2. 414 views
find real numbers a,b,c so that the graph of the function y=ax^2+bx+c contains the points (-11,4), (2,3) , and (0,1)Write three
1. 1 answer
2. 763 views
solve each system of equations using matricesx+2y-3z=0 2x-4y=z=-7 -2x+2y-3z=4 I don't see how it is possible to even attempt a
1. 1 answer
2. 1,055 views
What international moral code, if any, is being violated by the Bank?What bank? What did "the Bank" do that might have violated
1. 1 answer
2. 402 views
a 1.0 metal head of a geology hammer strikes a solid rock with a velocity of 5.0 m/s. Assuming all the energy is retained by the
1. 2 answers
2. 1,288 views
Which provides more cooling for a styrofoam cooler, one with 10 lbs of ice at 0 degrees C or one with 10 lbs of ice water at 0
1. 3 answers
2. 1,847 views
lead is a soft, dense metal with a specific heat of 0.028 kcal/kg degrees C, a melting point of 328.0 degrees C and a heat of
1. 2 answers
2. 1,065 views
A 50.0 g silver spoon at 20.0 degrees Celsius is placed in a cup of coffee at 90.0 degrees C. How much heat does the spoon
1. 5 answers
2. 8,861 views
Spent steam from an electric generating plant leaves the turbines at 120.0 degrees Celsius and is cooled to 90.0 degrees
1. 3 answers
2. 1,567 views
Find the general solution of the differential equation specified.1) dy/dt= 1/(ty+1+y+1) 2) dy/dx=sec y I got y(x)=arcsin(x) for
1. 1 answer
2. 835 views
What are the sectores of the economy?Since this is not my area of expertise, I searched Google under the key words "<I>economy
1. 1 answer
2. 709 views
waht is the impact of a stock repurchase on a companys debt ratio? Does this suggest another use for excess cash?The <b>correct
1. 2 answers
2. 698 views
What is the average ion concentration in a 7.9 mL saturated solution of calcium hydroxide containing calcium chloride (CaCl2)?
1. 1 answer
2. 517 views
Can someone tell name 6 effects of ocean currents?Thanks Since this is not my area of expertise, I searched Google under the key
1. 1 answer
2. 548 views
How do I do a Bibliography for an interview?Thank you for using the Jiskha Homework Help Forum. Here are some sites on how to
1. 1 answer
2. 659 views
Why is it impossible to have an Arctic Circumpolar Current?http://www.whoi.edu/science/PO/arcticgroup/projects/proshjohnson-two-
1. 1 answer
2. 539 views
1. How do meteorologists forecast El Nino and La Nina?2. Effects of El Nino and La Nina with regards to ocean currents and air
1. 1 answer
2. 680 views
How do clouds form, and where in canada would you expect to see certain types of clouds. What is the difference between clouds
1. 2 answers
2. 693 views
Directions say that I have to solve and graph the equation using words.I have to include whether the lines are dotted or solid,
1. 1 answer
2. 502 views
Directions are that i have to solve the equation and graph it using words.I have to include whether itis a solid or dotted line
1. 1 answer
2. 521 views
Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them!Problems: 2.Your quiz grades are 19, 17, 20, and
1. 1 answer
2. 409 views
Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them!Problems: 2.Your quiz grades are 19, 17, 20, and
1. 2 answers
2. 521 views
Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them!Problems: 2.Your quiz grades are 19, 17, 20, and
1. 3 answers
2. 780 views
Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them!Problems: 2.Your quiz grades are 19, 17, 20, and
1. 1 answer
2. 880 views
x^2+4
1. 3 answers
2. 245 views
x^2+4x^2+4 = (x + 2 i) (x - 2 i) Wouldn't you need a value for x? Or do u just have to make an expression? An expression for
1. 1 answer
2. 374 views
Why does covering and refrigerating food help reduce spoilage from mould?
1. 4 answers
2. 1,065 views
What were the key arguments for and against U.S. imperialism during the Spanish American War??
1. 2 answers
2. 810 views
How would I find the a for the equation y= a(x-h)^2+k. I'm looking at a graph, and I can solve for everything except for a. What
1. 5 answers
2. 382 views
How do you write a quadratic equation in standard form for a given set of zeros?
1. 4 answers
2. 3,741 views
Erik bicycles 32 km/h with no wind. Against the wind he bikes 33 km in the same time it takes to bike 63 km with the wind. What
1. 5 answers
2. 1,044 views
Erik bicycles 32 km/h with no wind. Against the wind he bikes 33 km in the same time it takes to bike 63 km with the wind. What
1. 5 answers
2. 547 views
find pH of 0.050 M HCLO4 plus 0.050 M HBr> You must consider activities>
1. 2 answers
2. 902 views
Assume that men constitute 49% of population in a country. Assumealso that among men there are 5% of color-blinded. Find the
1. 1 answer
2. 394 views
This is my english assignment, hope someone will look over it for me!! ThanksIdentify the phrase in the sentence below, and name
1. 3 answers
2. 582 views
I have did the corrections for my english homework I posted a few days ago. Can someone check it over again and give me some
1. 3 answers
2. 572 views
Indicate the gendr of the bracketed words. I tired them but I am not sure am I right or not. Please look over it and give me
1. 5 answers
2. 446 views
This is one of my english homework. Can someone have a look at it and give me some suqqestions. Thank you.The Summary of English
1. 2 answers
2. 1,136 views
This is a homework assignment for my Psychology course on Memory and learning.Find a Movie/video clip (1-3 mins)that demonstrate
1. 3 answers
2. 610 views
Four charges on a rectangle that is 6 cm by 3 cm. All but one of the corners has a positive charge. The magnitudes of the
1. 2 answers
2. 635 views
The crystal structure of lithium sulfide (Li2S) is pictured here. The length of the unit cell is 5.88 x 10^2. For this
1. 1 answer
2. 841 views
The crystal structure of lithium sulfide (Li2S) is pictured here. The length of the unit cell is 5.88 x 10^2. For this
1. 2 answers
2. 1,032 views
5(2n + 4) - 3(4n - 6) = 2(20 - n)I solved this equation and this is what I got. 10n + 20 - 12n + 18 = 40 - 2n -2n + 38 = 40 -2n
1. 3 answers
2. 728 views
What task component distinguishes the Wechsler Scales from the SBIS?
1. 1 answer
2. 1,026 views
what is n/15=120
1. 1 answer
2. 279 views
A stationary billiard ball, mass 0.17 kg, is struck by an identical ball moving at 2.7 m/s. After the collision, the second ball
1. 4 answers
2. 2,819 views
What is a generalization for this set of polygons: square, hexagon and a pentagon
1. 3 answers
2. 1,228 views
a description of a specific macroeconomic phenomenon or event and how it has impacted you
1. 2 answers
2. 824 views
How do you find a formula for f(x) and g(x) if h(x)=f[g(x)] h(x)=(2x^3-5)^4
1. 1 answer
2. 251 views
If today is Tuesday, what integer stands for last Sunday?
1. 7 answers
2. 789 views
solve by elimination method 5x+2y=-13, 7x-3y=17
1. 2 answers
2. 1,023 views
The leg and cast in the figure below weigh 280 N, with the center of mass as indicated by the blue arrow in the diagram. The
1. 1 answer
2. 872 views
A bag of sugar weighs 4.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is
1. 4 answers
2. 3,900 views
graph the inequality on a plane3x+4y is less then or equal to 12
1. 2 answers
2. 469 views
graph the inequality on a plane3x+4y is less then or equal to 12
1. 1 answer
2. 357 views
A 512 kg satellite is in a circular orbit about the Earth at a height above the Earth equal to the Earth's mean radius.(a) Find
1. 2 answers
2. 862 views
A sample of blood is placed in a centrifuge of radius 20.0 cm. The mass of a red blood cell is 3.0 10-16 kg, and the magnitude
1. 3 answers
2. 1,053 views
The total cross-sectional area of the load-bearing calcified portion of the two forearm bones (radius and ulna) is approximately
1. 2 answers
2. 535 views
I have to find the function rule that goes with this table...X Y 2 8 4 18 7 33 9 43 12 57 I've been trying to figure it out for
1. 1 answer
2. 453 views
If a confidence interval for the mean is 24.8 < ì < 29.6. What is the margin of error?
1. 1 answer
2. 324 views
A group of 56 randomly selected students have a mean score of 30.8 and astandard deviation of 4.5 on a placement test. Find a
1. 2 answers
2. 601 views
A group of 56 randomly selected students have a mean score of 30.8 and astandard deviation of ó = 4.5 on a placement test. Find
1. 2 answers
2. 1,048 views
Independent samples of n1 = 400 and n2= 400 observations were selected from binomial populations 1 and 2, and x1 = 100 and x2 =
1. 2 answers
2. 543 views
What force is required to accelerate an object having a mass of 3 kg at 5 m/s2?
1. 4 answers
2. 2,837 views
Use implicit differentiation to find dy/dx.ln xy + 5x = 30
1. 2 answers
2. 1,161 views
Locate any relative extrema and inflection points.y = (ln x)/x
1. 1 answer
2. 471 views
Use the derivative to determine whether the function is strictly monotonic on its entire domain and therefore has an inverse
1. 3 answers
2. 1,138 views
Find the inverse of f(x) = (x+2)/x
1. 1 answer
2. 337 views
You need 50 pounds of two commodities costing $1.25 and$1.60 per pound.a) Verify that the total cost is y=1.25x + 1.60(50 - x),
1. 2 answers
2. 798 views
Find the area of the largest rectangle that can be inscribed under the curve y = e^(-x^2) in the first and second quadrants.
1. 1 answer
2. 751 views
Solve the equation for x.arcsin(sq. rt.(2x)) = arccos(sq. rt(x))
1. 1 answer
2. 329 views
Verify each identity.a) arcsin(-x) = -arcsin x; abs. val. (x) is less than or equal to 1. b) arccos(-x) = pi - arccos x; abs.
1. 1 answer
2. 370 views
Find the derivative of the function.f(x) = arctan (x/a)
1. 2 answers
2. 569 views
Find the derivative of the function.h(x) = x^2 arctan x
1. 1 answer
2. 426 views
Find the derivative of the function.y = x arccos x - (sq. rt. (1 - x^2))
1. 1 answer
2. 313 views
Verify the differentiation formula.d/dx[arcsin u] = u'/(sq. rt. (1-u^2))
1. 1 answer
2. 445 views
Find the integral of 2x/(x^2 + 6x + 13)dx
1. 2 answers
2. 602 views
The graph of y = 3x^2 - x^3 has a relative maximum at what point?
1. 3 answers
2. 1,937 views
A line through the origin rotates around the origin in such a way that the angle, θ, between the line and the positive x-axis
1. 1 answer
2. 736 views

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