Hi! Can you please explain number 1 on page 242 on the 4th edition of the PWN book?
Woops! Forgot part of first equation in question just submitted. Here is the full question:
(x + 2)^2 + (y – 3)^2 = 40
y = -2x + 4
Which could be the x-coordinate of a solution to the system of equations above?
B) √35 / 2
C) (6 + 2√34) /5
D) (4 + 2√191) /5
Could you please explain number 7 on page 29?
Can you explain the “mathy” way to do problem 14 on Official Test 10? (I backsolved and got the correct answer, but I wondered if the “official” way to solve it was faster.)
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. 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.
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?