McGraw Hill Glencoe Algebra 2, 2012
MH
McGraw Hill Glencoe Algebra 2, 2012 View details
Standardized Test Practice

Exercise 17 Page 869

Practice makes perfect
a

We want to write an expression for Amanda's total weekly earnings. Let's take a look at the given table.

Amanda's Work Hours
Sunday 0
Monday 6
Tuesday 4
Wednesday 0
Thursday 2
Friday 6
Saturday 8

Amanda's total weekly earnings can be written as her hourly wage times the total number of hours she worked throughout the week. Total Weekly Earnings ( Hourly Wage)* ( Total Number of Hours) We know that Amanda earns $6 per hour. We can write the total number of hours as a sum of the hours Amanda worked each day. Total Number of Hours 0+6+4+0+2+6+8 We can now write the expression for Amanda's weekly earnings. Total Weekly Earnings $ 6( 0+6+4+0+2+6+8)

b

We will evaluate the expression from Part A using the Distributive Property. We will drop the dollar sign while calculating for simplicity. Let's do it!

6(0+6+4+0+2+6+8)
6(0)+6(6)+6(4)+6(0)+6(2)+6(6)+6(8)
0+36+24+0+12+36+48
156

The expression from Part A is equal to 156. This means that Amanda's total weekly earnings were $ 156.

c

Michael also earns $6 per hour and has earned $192 this week. We want to write and solve an equation to find how many more hours Michael worked than Amanda. We know from Part B that Amanda earned $156 this week. This lets us write the difference between Michael's and Amanda's earnings.

How Much More Michael Earned Than Amanda: $192 - $156 Let's call the difference between the number of hours Michael worked this week and the number of hours Amanda worked this week x. x = Michael's Hours - Amanda's Hours Because Michael and Amanda both earn $6 per hour, we know that for every $6 Michael earned more than Amanda, he must have worked 1 hour more. Therefore, x is equal to the difference in Michael's and Amanda's earnings divided by 6. x = 192- 156/6 Note that this is one of multiple ways to write the equation we are asked to find. Now, let's evaluate the right-hand side in order to find x!

x = 192-156/6
x = 36/6
x = 6

Michael worked 6 hours more than Amanda.