Author Archives: Elizabeth

ACT Question of the Day Explained – February 19, 2014 – Algebra, Linear Equations

Today’s ACT question of the day is secretly asking if you know the meaning of y = mx + b.  We have to figure out which graph looks like y = 3x +1. Yes, you could graph that on your calculator, but if your graph’s scale doesn’t match the scale of the graphs in the test booklet, you might not find the answer that way. Continue reading

ACT Question of the Day Explained – February 17, 2014 – Science

Today’s ACT question of the day comes from the same science passage we saw about a week ago.

We are given a table of sediment concentrations at various depths that’s something like this:

Depth
(cm)
Temperature
(oC)
pH Concentration in sediment (ppm)
SO42– S2– CO2 Fe3+ Fe2+ O2
 0  4 7.0 7.0 0.0 1.0 4.0 0.5 2.0
 5  5 6.5 5.0 2.0 1.5 3.0 1.5 1.0
10  7 6.0 3.5 3.5 2.0 2.0 2.0 0.0
15  9 5.5 3.3 3.8 3.0 0.8 3.8 0.0
20 10 5.0 3.0 4.0 1.0 0.5 4.0 0.0

The test maker would like us to tell them which ion and dissolved gas will not be helpful in determining whether a sample was taken from either 15 or 20cm. Continue reading

SAT Question of the Day – February 17, 2014 – Identifying Sentence Errors

 

Thurgood Marshall, 1967

Today’s SAT question of the day is an identifying sentence errors question with a classic error.

According to this sentence, Thurgood Marshall is known for his quest to end racial discrimination, his opposition to the death penalty, and he supported free speech and civil liberties. Continue reading

SAT Question of the Day Explained – February 15, 2014 – Math, Algebra

Today’s SAT question of the day is a math question that is rated hard. If you work along with me step by step, I think you’ll see that this problem really isn’t so hard after all. In fact, we are even going to discuss two ways to solve it.

Here is the problem: we have a revenue model that is expressed by r(p) = 2,000p – 10p^2. We need to know which of the values in the answer choices will give us the greatest revenue. Continue reading