## 1.

The Correct Answer is (B) — The average of a set of numbers can be found by adding all the numbers together and dividing by the number of students. The total number of magazines purchased by the students is 19 + 8 + 9 + 7 + 2 =45. Dividing this number by the number of students (5), we get the answer of 9.

## 2.

The Correct Answer is (D) — To find the difference between two numbers, we can subtract one term from the other. The two terms in this problem are p – 3 and p + 4, thus the difference is p + 4 - (p - 3) = p + 4 - p + 3 = 7.

## 3.

The Correct Answer is (A) — First convert the percentages into factors. Since the 12.1% was an increase, we multiply the original population (p) by 1.21. We then multiply this new population by 0.95 to find the final population. Consequently, the final population is p x 1.21 x 0.95 = 1.065p indicating that there was a 6.5% total increase in the population.

## 4.

The Correct Answer is (C) — The median of a set of numbers if the value of the middle term when the terms are in numerical order. In this case, 5 and 7 are both middle terms, and we must find the average of these two values to find the median. The median is 5 + 7 / 2 = 6.

## 5.

The Correct Answer is (C) — At the 4th month, the population of lions was around 20, while the population of zebras was around 60. 20 x 3 = 60 so (C) is the correct answer.

## 6.

The Correct Answer is (C) — We can immediately eliminate choice (D) because adding any number to 900 results in a sum greater than 900. Because 300 + 300 + 300 = 900 we know that 299 cannot be the answer because all three terms would be less than 300. Similarly, we know that 300 cannot be the answer as the other two terms would be less than 300. This leaves us with answer (C).

## 7.

The Correct Answer is (C) — Using rules for exponents, we can write $4^{2y}$ as $(4^{y})^{2}=256$. Taking the square root of each side, we get $4^{y}=16$. $4^{2}=16$ so the answer is y = 2.

## 8.

The Correct Answer is (C) — Slope is calculated by dividing the difference between the y-components by the difference of the x-components. Thus the slope is (5 - 1) / (2- ( -10/3)) = 3/4

## 9.

The Correct Answer is (C) — To find the answer to this problem, we can find the slope of this graph. We first estimate that the number of patients in 1984 is approximately 5000 and that the number of patients in 2011 is approximately 1500. To find the slope we calculate (1500 - 5000)/(2011 - 1984) = -121. The word "decrease" implies the negative sign and the closest answer to this number is (C)120.

## 38.

The Correct Answer is (5) — Converting \$100 to pesos at 13 pesos/dollar gives us 100(13) = 1300 pesos. However, 2.5% of this is taken as a conversion charge, so the actual amount Monique receives is 1300 - 1300(0.025) = 1267.5 pesos. When she converts this back into US dollars at the rate of 13 pesos/dollar, we gets back (1267.5 pesos) X (dollar/13 pesos) = 97.5 dollars. However, once again 2.5% is taken away as a fee so the actual amount Monique receives is 97.5 - (97.5)(0.025)= 95 dollars. The question asks how much money Monique loses in total over the transaction so the answer is 100 - 95 = 5 dollars.