Answer:
2. 40
8. 3
Step-by-step explanation:
For the first problem, let's input the numbers in for the letters they represent. Since [tex]5b^3[/tex]'s b corresponds with 2, let's plug 2 in for b and ADD PARENTHESIS. This is so important in the rule of PEMDAS: Parenthesis, exponent, multiplication, division, addition, and subtraction; the rules on how to solve a equation.
[tex]5(2)^3[/tex] Plugged in
To solve this, we need to take care of the exponent first because of the rule of PEMDAS. So let's solve 2^3.
2^3 is equivalent to 2*2*2 which is 8.
5(8)=40
For the second problem, we just need to plug in the variables again for the numbers they are being represented by.
c is 7 and a is 4.
c-a=7-4=3
