If a + 3b = 13 and a + b = 5, the value of b is?

A. 1

B. 4.5

C. 7

D. 4

8265/28500 as a percent

What number must you add to complete the square? x^2+6x=23

Compare the decimals 9,135.40 and 9,135.4.

A California condor left its cliff-side nest and soared downwards at a rate of 16 meters per second. After 8 seconds, the bird soared upwards 71 meters to land on a ledge with an elevation of 1364 meters. What is the elevation of the condor's nest?

I divided one hole number by another hole number and got 3.125 on my calculator. both my numbers are less than 50 but I'v forgotten what they are. Can you work out what they are?

Find the missing number in the following pattern explain your reason 12,24, 72, and 288,

How to find the Base and height of the triangle

Lita estimates she will read 24 books during the summer. She actually reads 9 books. what is the percent error of her estimate?

We mathematical induction to prove the statement is true for all positive integers n. 8+16+24 + ... + 8n=4n (n+1)

How do we know that it's a parallel line