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Muhammad
Questions and answers by visitors named
Muhammad
Questions (58)
The base of a solid is the circle x2 + y2 = 9. Cross sections of the solid perpendicular to the x-axis are equilateral
4 answers
5,872 views
The base of a triangle is decreasing at the rate of 2 cm/ min and the height is increasing at the rate of
1cm/ min. Find the rate
4 answers
1,509 views
For each of the following statements, state whether it is true (meaning, always true) or false (meaning, not always true):
1. Let
4 answers
1,580 views
Find the distance (measured in earth radii, RE) from the center of the earth to a point outside the earth where the acceleration
3 answers
917 views
I Have an assignment that requires me to design, write and carry out an analysis and a report of survey from beginning to end
3 answers
501 views
A rocket carrying a satellite is accelerating straight up from the earth's surface. At 1.20 after liftoff, the rocket clears the
2 answers
537 views
How many moles of Fe3O4 are required to supply enough iron to prepare 0.442 mol Fe2O3?
4 answers
4,449 views
1000g of a 55%(mass percentage) nitric acid solution is to be diluted to 20%(mass percentage) nitric acid solution.how many
2 answers
489 views
1000g of a 55%(mass percentage) nitric acid solution is to be diluted to 20%(mass percentage) nitric acid solution.how many
4 answers
560 views
Approximate the followin. 1.2.7272to 2d.p
2 answers
1,026 views
how many sig figs in this number: 32.6721
3 answers
517 views
Sodium thiosulfate, Na2S2O3, is used as a fixer in photographic film developing. The amount of Na2S2O3 in a solution can be
3 answers
1,676 views
Find the product and write in lowest terms.
10/51.3/8
3 answers
688 views
Why 0!=1 Plz help me to prove this statement.
3 answers
456 views
Hero in long way from Chicago book why
1 answer
426 views
Assume that there is no friction between m2 and the incline, that m2 = 1.8 kg, m1 = 1.4 kg, the radius of the pulley is 0.10 m,
1 answer
473 views
an ideal system absorbed some amount of heat and gas expand and the piston move to 0.4 meter against than the atmospheric
1 answer
386 views
you are baking cookies. recipe 2 cup sugar
1-1/2 cup flour 2 eggs a- you make one and one-half batches of cookies, how many eggs
1 answer
679 views
the oxygen produce was colleced by displement method at (22c)at a total pressure of (754torr)the vapor pressure of water at
1 answer
405 views
A perfect gas at 415 degree centigrade. The volume remains constant at 20 cubic meters and pressure of 1750 Gauge. Calculate the
1 answer
362 views
Two ants, red ant and black ant, creeping along lines in 3-space. At time t, red ant is at point on the line
x=3-t , y-2=2t ,
3 answers
552 views
The number of people expected to have a disease in t years is given by
y(t) = A.3^(t/a) (i) If now (year 2016) the number of
3 answers
562 views
Find dz/dy for the following :
xln(1-2y) = zsin((x^2)z)-3y+z
1 answer
403 views
Determine the relative extremum for the function ,
f(x,y)=((x^2)+(y^2))(e^-x)
1 answer
411 views
Find dz/dy for the following :
z=(e^xy)+2ycos(xy-1)
1 answer
381 views
Find the volume of the solid formed by rotating the region bounded by the graph of y equals 1 plus the square root of x, the
4 answers
1,952 views
The number of people expected to have a disease in t years is given by
y(t) = A.3^(t/a) (i) If now (year 2016) the number of
2 answers
499 views
Alisha is paying $20 for a large pizza,which is 18 inches in diameter, a better buy than paying $5 for a personal size pizza
2 answers
575 views
The diameter of a bicycle wheel is 14 cm.What is the distance covered by it in 50 revolution
2 answers
609 views
7. Research examining the perceptual abilities of newborn and very young infants has:
a) provided little information regarding
6 answers
1,004 views
charles has been told by the doctor he has lung cancer that is beyond treatment. His doctor tells him that he will probably die
4 answers
645 views
15. How might adolescents’ tendency to engage in such risky behaviors as unsafe sex and experimental drug use reflect brain
4 answers
1,407 views
Which of the following scenarios is the best example of positive reinforcement?
A. Maria now buys a different brand of cigarettes
4 answers
1,313 views
Which of the following scenarios is the best example of negative reinforcement? a. Vanna fastens her seatbelt as soon as she
4 answers
3,456 views
There are fifty students in a class. In a 100 marks exam, 20 students scored less than 30 marks, 5 students scored more than 70
2 answers
767 views
Shopkeeper sells his goods at 20% above the cost price. What will be the percentage profit he will earn if he discounts the
3 answers
680 views
3/5+3/17=
2 1/2 1 0 need help
4 answers
313 views
Emily hired a new employee to work in your bake shop. In one hour the employe burned 660 chocolate chip cookies. If this
3 answers
442 views
A ship, proceeding southward on a straight course at the rate of 12 miles/hr is, at noon,
40 miles due north of a second ship,
2 answers
688 views
In a certain examination, 52 candidates offered Biology, 60 candidates offered History and 96 offered Mathemathics, if 21
7 answers
1,313 views
The sum of 9 and a certain number one and times the first number.find the number.
1 answer
286 views
Suppose that Var(X)=2 . The variance of 2−3X is: Var(2−3X)
4 answers
1,175 views
Is it always true that E[X2]≥(E[X])2 ?
Yes or No
1 answer
194 views
We have two coins, A and B. For each toss of coin A, we obtain Heads with probability 1/2; for each toss of coin B, we obtain
4 answers
1,889 views
Suppose a random variable X can take any value in the interval [−1,2] and a random variable Y can take any value in the
4 answers
2,507 views
Let X be a uniform random variable on the range {−1,0,1,2}. Let Y=X^4. Use the expected value rule to calculate E[Y].
E[Y]=
2 answers
842 views
The random variable X has a standard normal distribution. Find the PDF of the random variable Y , where:
1. Y = 5X−7 . 2. Y =
5 answers
2,785 views
Every person has a random number of children, drawn from a common distribution with mean 3 and variance 2. The numbers of
4 answers
2,371 views
Let X and Y be independent normal random variables.
a) Is 2X−4 always normal? b) Is 3X−4Y always normal? c) Is X^2+Y always
5 answers
1,908 views
The density of mercury is 1•36×10^4kgm^3 at 0°c.calculate it values at 100°c and at 22°c take 3 linear expansivity if
3 answers
282 views
An aero plane flies from a town X on a bearing of N45°E to another town Y, a distance of 200km. it then changes course and
3 answers
343 views
5-kg box is released from rest on a frictionless incline has a uniform acceleration of 0.24 m/s2, what is the velocity of the
4 answers
887 views
If a wire has a resistance of 1.32 a lenth of 110cm and area of cross sectional of 0.00415cm, The final resistivity of which it
1 answer
225 views
Calculate the area of sector of a circle which subtends an angel of 45°at the center of the circle, radius 14cm. Solve this
5 answers
378 views
A binomial distribution has probability function P (X=x)=k (1/3)^x (2/3)^7-x , where x=0,1,2,3,4,5,6,7
Find mean and varience.
1 answer
62 views
binomial distribution has probability function P (X=x)=k (1/3)^x (2/3)^7-x , where x=0,1,2,3,4,5,6,7
Find mean and varience.
1 answer
57 views
Each of 16 students measured the circumference of a tennis ball by four different methods, which were: Method A: Estimate the
1 answer
122 views
The sum of two numbers is 21.two-thirfs of the other number to give 15.find the two numbers showing clearly your working
2 answers
130 views
