A) Since you gain 10 points for every basket you make and you made 7, you start by multiplying 7 by 10, which is 70. Since you loose 15 for each one you miss and you missed 3, multiply 3 by 15 (45) and subtract from 70. The answer is 25.
B) Since they made two baskets, you multiply 2•10 (20). Then you subtract the baskets missed multiplied by the points you loose for each (8•15=120, 20-120= -100). Their score was -100.
C) You need to use addition, so you are going to put the points that you loose for missing first. It will be a negative number.
-15•5=-75 Your first number is -75
Next, you will add the point for what you made.
5•10=50 The second part of your expression is +50
Your expression is -75+50
