word problems to expressions

Hazel worked as a receptionist at the courthouse last week for 23 hours for a salary of d dollars per hour. How could you write an expression that show Hazel’s earnings ?

Since 23 is the amount of hours she worked and we know that she gets d dollars per hour, we would multiply 23 times d. This would be written as:

23d

The minimum wage set in 1997 was $5.15 per hour. A worker’s weekly work hour consisted of 40 hours per week. Write and evaluate an expression where h = $5.15 to find a worker’s weekly salary.

40h is the expression

Substitute $5.15 for h and evaluate

40(5.15) = 206.00

Workers earned $206.00 per week

Kylie’s garden is surrounded by a fence. A diagram of the fence is shown.

Write an expression that represents the perimeter of the fence as the sum of the side lengths.

First, write an expression adding the side lengths12 + 6a + 3a + 12, + 4(a-4) Next, distribute12+6a+3a+12+4a-16Now, use commutative and associative to simplify(6a+3a+4a) + (12+12-16)Finally, simplify:13a + 18