A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.

The area of a rectangle is equal to its length x width:

a = l x w
a = a x b
a = 4 x 6
a = 24

The first step to solve a quadratic expression that's not set to zero is to solve the equation so that it is set to zero:

b² - 7b + 35 = 5b - 1
b² - 7b + 35 + 1 = 5b
b² - 7b - 5b + 36 = 0
b² - 12b + 36 = 0

Next, factor the quadratic equation:

b² - 12b + 36 = 0
(b - 6)(b - 6) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, (b - 6) must equal zero:

If (b - 6) = 0, b must equal 6

So the solution is that b = 6

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.

(2a)(4ab) + (7a²)(8b)
(2 x 4)(a x a x b) + (7 x 8)(a² x b)
(8)(a¹⁺¹ x b) + (56)(a²b)
8a²b + 56a²b
64a²b

The volume of a cylinder is πr²h:

v = πr²h
v = π(2² x 3)
v = 12π