**Question 71 – “In the figure…”**

OG Explanation is fine.

**Question 72 – “If x^2…”**

**Question 73 – “If Mel saved…”**

OG Explanation is okay. It might be easier for you to move directly to the answer choices. To quickly calculate 15%, it is 1.5 times 10%.

a) 15% of 45 = 4.50 + 2.25 < $10

b) 15% of 67 = 6.70 + 3.35 > $10

Thus, **the answer is B**.

**Question 74 – “If x=-1…”**

OG Explanation is fine.

**Question 75 – “Today Rose..”**

OG Explanation is sufficient.

**Question 76 – “If a square region..”**

OG Explanation is mediocre.

**Question 77 – “Temperatures..”**

OG Explanation is fine

** **

**Question 78 – “The prime sum…”**

OG Explanation is fine.

**Question 79 – “If x is to be chosen…”**

OG Explanation is okay. The key to this problem is recnizing that the product of xy will be even except when x and y are both odd. Because x and y are independent events, the probability that both x and y will both be odd is the multiple of the individual probability:

**Question 80 – “At a garage sale, …”**

OG Explanation is fine.