Solve for x, y and z

3x - 3y + 5z = 13

5x + 6y - 2z = 10

7x + 5y = 18

Simplify. 3[5 (10 - 3) ²]

George weighed 170 lbs when he started college. If he gains just 0.25 lbs after each month for 4 years of college, how much will he weigh? What if he keeps that weight gain for the next 6 years after college?

Three circles with centers A, B and C have respective radii 50, 30 and 20 inches and are tangent to each other externally. Find the area in (in^2) of the curvilinear triangle formed by the three circles

Dylan is six years older than his sister. If his sister's age is represented by the variable s, which of the following expressions represents Dylan's age?

What is the constant of proportionality in the equations x/y=2/9 A) 2/9 B) 2 C) 9/2 D) 9

Whar is the value of x (x+1) + (2x-15)

Expand then simplify 2 (x-5) + 2x

A set of speakers costs $22 and songs cost $1.25 each. The sales tax rate is 7.5%. The expression 0.075 (22 + 1.25s) can be used to determine the amount of sales tax due on the entire purchase.

The lengths of nails produced in a factory are normally distributed with a mean of 5.13 centimeters and a standard deviation of 0.04 centimeters. find the two lengths that separate the top 8% and the bottom 8%.

A village lost 15% of its cows in a flood and 10% of the remainder died of diseases. If the number left now is 7650, what was the original number of cows before the flood