What is the solution to 21x+7y=42

-5x+5y=10

The scores on a test are normally distributed with a mean of 70 and a standard deviation of 14. Find the score that is two and one half standard deviations below the mean

2/3x=12 what's the answer?

If two events are independent, then: A. the sum of their probabilities must be equal to one. B. they must be mutually exclusive. C. their intersection must be zero. D. None of the above.

What can you divide from 20 to 16

Li ming is playing real life. she has saved 20,000 tokens and wants to buy furniture for her house. Each piece of furniture costs 2000 tokens. This graph shows how her savings would decrease if she bought 1,2 or 3 pieces of furniture.

Suppose that state's record high temperature of 102 was set in 1930, and the record low of -14was set in 1966. What is the range of these temperature extremes?

Max makes a scale drawing of distance between salt lake city and Arizona. The distance between salt lake city and Arizona is 21 cm. If each 7 cm on the scale drawing equals 250 kilometers, how far apart are the salt lake city and Arizona.

What is 2 square roots between 9and 10?

An office supply store sells pencils individually or by the case. Pencils purchased individually cost $0.97 each. One case of forty pencils costs $37.20. You have an annual budget of $95.00 for pencils. Without exceeding the annual budget of $95.

Suppose you were a carpenter. Give the lenght, width, and height of a storage cabinet with a volume of 72 cubic feet that you would build. Explain your choice.