Is it possible to solve question 3 of Solving systems of linear equations using the solving for expressions method? If so, how do you do it?
At long last, and just in time for the summer prep rush, the Math Guide is back to showing “usually ships in 1-2 days” at Amazon. (UPDATE 5/30/2020: now it’s all the way back in stock!) I still don’t have stock to ship myself, so if you want a physical book you have to go (more…)
Test 10 section 4 number 28
#19 (no calculator) from test 10
#20 (no calculator) from test 10
How do you do Test 9 section 3 number 20?
test 9 section 3 number 18
Amazon says it will take 10 days to ship me your book!
In light of yesterday’s announcement by the College Board that the June SAT is canceled, I am extending all current 3-month subscriptions to the Math Guide Online through August 29 (the date of the August SAT). New 3-month subscriptions purchased between now and May 29 will also be extended through the August date. Stay safe (more…)
UPDATE: Now you can sign up for trial access (3 days) to the whole Math Guide Online. A bunch of folks have asked me if there’s a free trial for the new Math Guide Online. Well, at launch there wasn’t but now there is! Click above. If you’re ready to purchase access to the whole (more…)
For the past few months I’ve been working on an online, interactive version of PWN the SAT: Math Guide, and I’m excited to announce that subscriptions are available now in the PWN store!
The country hall charges a rental fee of $1000 and at least $3000 for food. Olivia is planning a class reunion. If she had chosen a buffet that costs $38.56 per person what is the minimum possible number of people who must attend to support the expense?
OK, so you have 40 boys and 30 girls. That’s easy enough to calculate because you’re given a part:whole ratio (boys to total students) and you already know the total number of students is 70. Be careful about the second ratio, though, because it’s a part:part ratio! If the ratio of older to younger is (more…)
OK, so when you have a regular n-gon, you can figure out each angle in it using this formula: [(n-2)180]/n. In this case, 7*180/9 = 140, so we know each angle in the polygon is 140°. I couldn’t draw this quickly on the computer I’m on, so I found a good n-gon picture to mark (more…)
Thomas is making a sign in the shape of a regular hexagon with 4-inch sides, which he will cut out from a rectangular sheet of metal. What is the sum of the areas of the four triangles that will be removed from the rectangle?