The measures of Zx and Zy are equal. Which is the value of m?
-
m = 26
m = 8
m = 32

She used 87 minutes last month

Step-by-step explanation:

Step 1: Express the total monthly phone bill

The total monthly phone bill can be expressed as follows;

A=F+(R×M)

where;

A=total monthly phone bill

F=fixed income per month

R=additional rate per minute

M=total number of minutes

In our case;

A=$123.75

F=$102 per month

R=$0.25 per minute

M=m

replacing;

123.75=102+(0.25 of m)

123.75=102+(0.25×m)

123.75=102+0.25 m

123.75-102=0.25 m

0.25 m=21.75

m=21.75/0.25

m=87 minutes

She used 87 minutes last month