Answer:
Option A. Equation: 9(5+x)=99 and
Option C. Equation : 6 hours.
Explanation:
Matt charges $9 per hour to babysit.
He babysat Friday night for 5 hours and then he babysat again on Saturday.
His total earning s $99.00
Let Matt babysat x hours on Saturday
So total hours Matt did baby sitting = ( x + 5 ) [ Friday + Saturday ]
and total earning = 9 [ x + 5 ]
Equation to get the value of x hours will be 9 [x + 5 ] = 99.
We further solve this equation 9x + 45 = 99
= 9x = 99 - 45
= 9x = 54
= x = 6 hours.
Therefore, Option A. Equation: 9(5+x)=99 and Option C. Equation: 6 hours