Zach is 4 years older than twice his sister maya's age. maya is 5 years old. how old is zach?

2x-3y = 21 -5x+2y = 7 solve the system of equations

Slope of (-1,8) and (6,2)

Solve the system. - 4 = x - y 4 = - x + y

What is 307,495 rounded to the nearest thousand?

The difference of twice a number and seven is 17 find the number

Angela took a general aptitude test and scored in the 91st percentile for aptitude in accounting. (a) What percentage of the scores were at or below her score? (b) What percentage were above?

As mars revolves around the sun, it travels at a rate of approximately 15 miles per second. convert this rate to kilometers per second. at this rate, how many kilometers will mars travel in 20 seconds? assume that 1 mile is equal to 1.6 kilometers.

If u = 3 - 4i and v = 3i + 6, what is u - v.?

Wat does 5 represent in 4c+5=27

Explain in words how to find the product of - 4 (-1.5) on the number line