Find a value of k for which the following system has only one solution:

2x+y=7

y-kx=3

If the radius of a sphere is increased by 5 cm so that the area of the sphere obtained is increased by 400pi square cm. What was the radius before the increase

The heights of all female college basketball players produce a normal distribution with a mean of 68 inches and a standard deviation of 2 inches.

21.78*10^-6 in standard form.

In the design of an electromechanical product, 12 components are to be stacked into a cylindrical casing in a manner that minimizes the impact of shocks. One end of the casing is designated as the bottom & the other end is the top.

Three people equally shared of a pizza. What fraction of the whole pizza did each person eat?

The base of a square pyramid has a side length of 9 inches. The height of the pyramid is 21 inches. What is the volume of the pyramid? A. 189 in3 B. 567 in3 C. 850.5 in3 D. 1701 in3

A group of 5 friends is sharing 2 pounds of trail mix. Write a division problem and a fraction to represent this situation.

Which is better average: 10 of 15 free throws or 8 out of 10 free throws? Which is a better average?

Imagine you live only one mile from work and you decide to walk. if you walk four milesb per hour how long will it take you to walk one mile?

What is the next term of the arithmetic sequence? 8,5,2,-1,-4,?