Ben frank is an electrician who installs lighting fixtures. he charges (in dollars) his clients 15h+40f where h is the number of hours worked and f is the number of fixtures installed.
how much does ben frank charge when he works 7 hours and installs 9 fixtures?

$465

Step-by-step explanation:

Given expression: , where  h is the number of hours worked and f is the number of fixtures installed.

To find total charges (in dollars) when he works 7 hours and installs 9 fixtures, substitute h=7 and f=9 in the given expression, we get

Therefore, Ben Frank charges $465 when he works 7 hours and installs 9 fixtures.

1/4 and 8/3 because:

the reciprocal if 4 is 1/4 because 4 is used as 4/1 and the opposite of that is 1/4. the opposite of 3/8 is 8/3 so that is the answer.