The coordinate grid is composed of a horizontal x-axis and a vertical y-axis. The center of the grid, where the x-axis and y-axis meet, is called the origin.

The surface area of a cylinder is 2πr² + 2πrh:

sa = 2πr² + 2πrh
sa = 2π(1²) + 2π(1 x 2)
sa = 2π(1) + 2π(2)
sa = (2 x 1)π + (2 x 2)π
sa = 2π + 4π
sa = 6π

To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.

(4a)(3ab) + (8a²)(8b)
(4 x 3)(a x a x b) + (8 x 8)(a² x b)
(12)(a¹⁺¹ x b) + (64)(a²b)
12a²b + 64a²b
76a²b

You need to find the value of b so solve the first equation in terms of z:

-4b + z = -1
z = -1 + 4b

then substitute the result (-1 - -4b) into the second equation:

-9b + 1(-1 + 4b) = 2
-9b + (1 x -1) + (1 x 4b) = 2
-9b - 1 + 4b = 2
-9b + 4b = 2 + 1
-5b = 3
b = \( \frac{3}{-5} \)
b = -\(\frac{3}{5}\)

Perimeter is equal to the sum of the four sides:

p = a + b + c + d
p = 3 + 3 + 6 + 3
p = 15