# Hi Mike. I had a question about question 10 on page 218 from your PWN 4th edition Math guide book.

Hi Mike. I had a question about question 10 on page 218 from your PWN 4th edition Math guide book. If percent means divide by 100, why is it 8 x10^-4 instead of 8 x 10^-8? I thought I had to divide 8 x 10^-6 by a 100. Could you clear this up for me?

# On SAT Practice Test 8, I got marked incorrect on Question 7 of the Math No-Calculator section.

On SAT Practice Test 8, I got marked incorrect on Question 7 of the Math No-Calculator section. This is because I said -1 is a valid solution when it isn’t supposed to be. However, if you plug in -1 into the original equation, and say that the square root of 4 is -2, the solution remains true.

So my question is, on the SAT, are you only ever supposed to use the principle square root of numbers? Saying that the square root of 4 = -2 is what rendered my answer incorrect.

# This is a question from April 2018 QAS, Calculator Section, Problem 29.

This is a question from April 2018 QAS, Calculator Section, Problem 29.

I can’t figure out why choice D is the correct answer. I was stuck bw choice A and B, and picked A. Why is A wrong and D correct?

Thank you!

# Hi Mike. I had a question about problem 3 on page 284 of your PWN 4th edition book.

Hi Mike. I had a question about problem 3 on page 284 of your PWN 4th edition book. I don’t understand how you can put values of a, b, c, or d on to the sides. How do you determine which side is which letter?

# On pg. 96 question 11

On pg. 96 question 11 I’m confused with how you came up with your answer even with the explanation. What am I supposed to do there?

# On pg. 96 question 10

On pg. 96 question 10 I’m confused with how you came up with the answer 6, I got the answer -15. How did you come up with 6 I don’t understand?

# On pg. 96 question 9

On pg. 96 question 9 I’m confused with how you came up with the answer 2, I got the answer 4. How did you come up with 2 I don’t understand?

# I had a question about practice question #3 of the Angles, Triangles, and Polygons chapter.

I had a question about practice question #3 of the Angles, Triangles, and Polygons chapter. I understand the logic behind why A)15 is the answer (Triangle Inequality Theorem), but I think that C)22 could also be a possible answer because the problem never specifies whether RS is one of the two congruent sides or the non-congruent side. If RS were the non-congruent side, and 22 was the perimeter, the remaining sides would each be 6.5, which are not integers. Is my reasoning correct?

# What is the best way to solve this problem within ~1 minute? (given SAT time limit)

What is the best way to solve this problem within ~1 minute? (given SAT time limit)

# I had a question about Example 7 on Page 270 in the PWN Math Guide book fourth edition.

I had a question about Example 7 on Page 270 in the PWN Math Guide book fourth edition. I don’t understand how sin (15) is equal to cos (5pi/12). Could you explain this ?

# I had a question about example 1 on page 245 in the PWN Math Guide fourth edition book.

I had a question about example 1 on page 245 in the PWN Math Guide fourth edition book. I thought the side AM is equal to 3√3 because of the 30-60-90 rule but according to the answer, AM is 4. I understand how it is 4 but how is it not 3√3?

# Hi, I have a question for # 4 on pg. 78. Wouldn’t the answer to that question be -3?

Hi, I have a question for # 4 on pg. 78. Wouldn’t the answer to that question be -3?

# Could you please explain number 2 on page 28?

Could you please explain number 2 on page 28?

# Hi, I had some trouble with question #5 on p.242 of the PWN the SAT Math Guide book.

Hi, I had some trouble with question #5 on p.242 of the PWN the SAT Math Guide book.
I read the solution and just cannot figure out how to get the value of h, (b^3)/2.
Could you explain the steps on how to get the value of h? Do I have to use Pythagorean theorem or is it just solving for “h” in the triangle area formula?

# Hi! I was doing quadratic and exponential word problems on Khan Academy, and got this…

Hi! I was doing quadratic and exponential word problems on Khan Academy, and got this. Is it possible that this type of problem will be on the SAT, and if it is, please explain it.

Question(reworded): A guy travels up a river at v mph for 2 miles. He goes the same distance back, but 5 mph slower than he did on the way up. If he spent 3 hours traveling up and back, which could be used to determine his speed on the way up the river?

a) 2v^2-13v+17=0
b)3v^2-15v-4=0
c)3v^2-11v+10=0
d)3v^2-19v+10=0