Answer: 70
Explanation:
Substitute 4 for y in the expression (since y = 4)
Use PEMDAS (parentheses, exponents, multiplication, division, addition, subtraction)
5 * (4)^2 - 10
= 5 * 16 - 10 Evaluate the exponent first
= 80 - 10 Then multiply 5 and 16
= 70 Finally, subtract