Question

13
18 ÷ (5 + 4) · 5² - 7²
color this answer yellow.
18
8² ÷ 4² - 36 ÷ 9
color this answer purple.

Explanation:

Step1: Solve Q13: Parentheses first

$5 + 4 = 9$

Step2: Q13: Calculate exponents

$5^2 = 25$, $7^2 = 49$

Step3: Q13: Division and multiplication

$18 \div 9 = 2$; $2 \cdot 25 = 50$

Step4: Q13: Final subtraction

$50 - 49 = 1$

Step5: Solve Q18: Calculate exponents

$8^2 = 64$, $4^2 = 16$

Step6: Q18: Perform divisions

$64 \div 16 = 4$; $36 \div 9 = 4$

Step7: Q18: Final subtraction

$4 - 4 = 0$

Answer:

Question 13: $1$
Question 18: $0$