Substitute and simplify, X= 2, y = 9, z = -5
1. x + y + z = 6
2. 8x + 3 =
3. 4y + 3x2 =
4. xyz + 10 =
5. 2(y + 2) =

make sure you have version 2.50

try looking in the very back of the book : )

step-by-step explanation:

you can download it here

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

answer: 16

step-by-step explanation: first you would add 6+6 which equals 12 then add 2+2 which equals 4. then add 12 + 4 which is 16.

hope this ^_^