Liam is saving up for a new cell phone. He uses the equation P = I + HB, where P is the cost
of the phone, I is the amount of money he started with, H is the number of hours he babysits,
and B is his hourly rate for babysitting. Which expression is equal to H, the number of hours
Liam will need to babysit to save enough money for a cell phone?

H =  (P - I ) / B

Step-by-step explanation:

Given that : P = I + HB, where P is the cost  of the phone, I is the amount of money he started with, H is the number of hours he babysits,  and B is his hourly rate for babysitting.

We need to make H the subject of the formula, this is done by rearranging the formula so that H would be the subject. We just have to apply inverse operation to the equation to do this.

P = I + HB

Subtracting I from both sides:

P  - I = I + HB - I

P  - I = I - I + HB

P - I = HB

Dividing through by B:

(P - I ) / B = HB / B

H =  (P - I ) / B

can you give me more detail on this! ?

step-by-step explanation:

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