What is the area of the following circle?
Either enter an exact answer in terms of it or use 3.14 for IT and enter your answer as a decimal.
r = 7

A =153.86

Step-by-step explanation:

The area of a circle is given by

A = pi r^2

We know pi = 3.14 and the radius is 7

A = 3.14 * 7^2

A =153.86

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18