Exam 29: Expressions and Equations

Evaluate the expression 5(2 a + b ) + 3, when a = 1; b = 5.

Solve the equation 56 = z - 13.8 for the variable z .

The sides of a regular heptagon are equal. If the length of each side is expressed as 4.2 H + 2, what is the perimeter of the heptagon in terms of H .

Evaluate the expression 2D - 7, where D = 11.

The expression 4 x + 4 represents the length of the shortest side of a triangle . The longest side is 1.5 times the length of the shortest side. What is the length of the longest side in terms of x?

A rectangular prism is 21 3/32 inches wide. The length (L) is 23 11/16 inches longer than its width. What is the value of L in inches?

The circumference of the circular base of a cylinder is 52.8 inches. What is the diameter to the nearest thousandth of an inch? Use 3.1416 as the value of pi.

Symbols make it possible to develop mathematical formulas and equations.

Equations are used to solve problems where one or more quantities are not known.

A certain screw has 14 threads. This is 1/8 as many threads as there are on a second screw. If S represents the number of threads on the second screw, what is the value of S?