Question

Question 9 (5 points)

Answer 1

Answer:

• 9. B, 10. A, 11. A, 12. D

Step-by-step explanation:

Question 9

The smaller number is x, the greater number is x + 4, their sum is 52:

• x + (x + 4) = 52

Correct choice is B

Question 10

$8 and 9n should sum at least $80:

• 8 + 9n ≥ 80 ⇒ 9n ≥ 72 ⇒ n ≥ 8

Correct choice is A

Question 11

$43 and 3n should sum at least $70:

• 43 + 3n ≥ 70 ⇒ 3n ≥ 27 ⇒ n ≥ 9

Correct choice is A

Question 12

P books cost $10.01p and $9.96 for shipping, the total should be no more than $50:

• 9.96 + 10.01p ≤ 50 ⇒ 10.01p ≤ 40.04 ⇒ p ≤ 4

Correct choice is D