Billy has a gift card with a $150 balance. He buys several video games that cost $ 15 each. After the purchases, his gift card balance is $45. Write an equation to help find out how many video games Billy bought. How many games he bought

(Gift card's original Balance - Balance after purchases)  Answer / cost of game

(150 - 45) = 105.     105/15 = 7

He bought 7 games

Step-by-step explanation:

You do the 150 - the 45 to see how much he had spent.

Divide by the cost and it shows how much he bought

v = (b - n)/p

if v = # of games; b = original balance; n = new balance; p = price per game

v = 7; billy bought 7 games

Step-by-step explanation:

v = (150 - 45)/15 = 105/15= 7

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

step-by-step explanation:

what grade level is this? need to know so i can look in my old textbooks!