If a= -2, b=3 evaluate the expression 2a-3b

-13

Step-by-step explanation:

2(-2 )- 3(3)

-4-9

=-13

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.