## Could you please explain #38 of practice test 9?

Hey
Could you please explain #38 of practice test 9?

## Mike…check the wording on this Q (#37; section4). I lose track of what it’s asking for. Can you break it down? Tks!

Mike…check the wording on this Q (#37; section4). I lose track of what it’s asking for. Can you break it down? Tks!

The value of r is 20/21 times the value of t, where t>0. The value of t is what percent greater than the value of r?

## Test 5 Section 4 Number 24

Test 5 Section 4 Number 24

## Test 5 Section 4 Number 22

Test 5 Section 4 Number 22

## Test 7 Section 4 #30

Can you do Test 7 Section 4 #30?

## Test 5, Section 4, Questions 25 and 28. How do you get to the answers?

Test 5, Section 4, Questions 25 and 28. How do you get to the answers?

## Can you explain question #24 in Practice Test #8 Section 4?

Can you explain question #24 in Practice Test #8 Section 4?

## Will you please work #20 in section 4, Test 1.

Will you please work #20 in section 4, Test 1.

## based on the line graph above, which of the following best approximates the percent decreases in the number of farms in the united states from 1960 to 2000?

based on the line graph above, which of the following best approximates the percent decreases in the number of farms in the united states from 1960 to 2000?

## The circle graph above shows the percent of 4th graders at an elementary school who have the indicated numbers of pets in their homes…

The circle graph above shows the percent of 4th graders at an elementary school who have the indicated numbers of pets in their homes. If 68 of the 4th graders have at least one pet, how many have exactly two pets?

(A) 16
(B)17
(C)20
(D)33
(E)34

## M gallons of a p% salt solution must be mixed up with G gallons of a q% salt solution to produce an r% solution.

M gallons of a p% salt solution must be mixed up with G gallons of a q% salt solution to produce an r% solution. Which of the following best describes how to find the value of r? (This question is driving me insane.)

(A) (p + g) / (M + G) = r / 100

(B) (0.01p + 0.01q) / (M + G) = r / 100

(C) 0.01p / M + 0.01q / G = r / 100

(D) (0.01M + 0.01G) / (M + G) = r / 100

(E) (0.01pM + 0.01qG) / (M+G) = r / 100

## Weekend Challenge – Epic playlist

Thanks to Hurricane Sandy, this has been a rough week for a lot of people. If you’re feeling charitable, please note that I am still giving away Math Guides for donations to the Red Cross. Let me note, before we get into this, that these challenge questions are WAY harder than anything you’d see on (more…)

## Midweek Challenge – Students doing weird things for no reason edition

I’m going to be out of town for a few days, so I won’t be able to post a solution for this until probably Monday, but hopefully I’ll be able to check in and at least congratulate the winner, who will receive a free copy of my Math Guide. A student is drawing concentric circles, (more…)

## Weekend Challenge – Have You Seen Me Lately?

I went back to my old high school last night to attend the final concert of the choir director that presided over so many of my formative moments. I got to hang out with some of the same people with whom I used to have the kind of deep, meaning-of-life conversations that only happen in (more…)

## A weekend challenge about rats. Rats are fun!

I’m going to tell you a secret: I don’t sleep well at all the night before SAT scores are released. It’s not like I even took it. I just get so excited for all the kids I’ve worked with that I can’t sleep. So last night, after a sleepless night followed by a bunch of (more…)