Easy Elementary Algebra

Front

k - 9 = 10

Back

k = 19

Answer explanation

To solve for k, add 9 to both sides of the equation: k - 9 + 9 = 10 + 9. This simplifies to k = 19. Therefore, the correct answer is 19.

Front

r x 5 = 20

Back

4

Answer explanation

To solve for r in the equation r x 5 = 20, divide both sides by 5. This gives r = 20 / 5, which simplifies to r = 4. Therefore, the correct answer is 4.

Front

s ÷ 9 = 2

Back

18

Answer explanation

To solve for s, multiply both sides of the equation by 9: s = 2 × 9. This gives s = 18, which is the correct answer.