Hello! For question #8 on page 111 in the Exponents and Exponential Functions section, where did the 2^2 come from? The answer was 82.41*2^2= 329.6. Thank you ^_^.

# Hi! For question #9 on page 111…

Hi! For question #9 on page 111 in the Exponents and Exponential Functions section, how did you get 2mn in m^2+2mn+n^2=m^2+n^2? Thank you!

# If the graphs of y=f ^-1(x) and y=f(x) are identical…

If the graphs of y=f ^-1(x) and y=f(x) are identical then each of these graphs must be symmetrical about the

A)y-axis B)X-axis c)origin d)line y=-x e)line y=x

# If y varies directly with the square of x…

If y varies directly with the square of x and y = 4.3 when x = 5, what is the value of y when x = 6?

A) 0.2

B) 3.0

C) 5.2

D) 6.2

E) 209.3

# In the figure above ac is a diameter of a circle with center 0…

In the figure above ac is a diameter of a circle with center 0 if ab =3 and bc=5 then the area of the semicircle abc is ?

# Hi – I have the fourth edition (2016). Is this the latest edition? Do you have any updates available online? Thanks!

Hi – I have the fourth edition (2016). Is this the latest edition? Do you have any updates available online? Thanks!

# Can you explain a more direct way to solve College Board Official Practice Test 9, Math Section 4 #19, than the College Board’s explanation?

Can you explain a more direct way to solve College Board Official Practice Test 9, Math Section 4 #19, than the College Board’s explanation? I seem to remember something about making a chart to solve mixture problems. Would that work here?

# COLLEGE BOARD Test 9 Math Section 3 #13

COLLEGE BOARD Test 9 Math Section 3 #13

Could you suggest a shortcut or fast way to solve this? All the answers are written in vertex form, so we can quickly eliminate two of them, as the coordinates of the vertex, as indicated by the graph provided, must be (3,1). That leaves choices A and C. Is there a quick way to solve from there without plugging in values from the graph?

# Hey Mike, on question #3 page 189…

Hey Mike, on question #3 page 189 I dont understand how to make the equation with the problem and the explanation didnt help me.

# Hello Mike, For problem 2 on page 284…

Hello Mike,

For problem 2 on page 284 (relating to “Working in Three Dimensions”), I had difficulty answering the question, because I don’t know what the inner radius of a sphere and how that differs from the outer radius of a sphere. Since I’m not able to find anything on the Internet that talks about this, could you please explain the difference to me?

And could you then tie it back to how the entire inner/outer radius thing is relevant to the question at hand (#2 on page 284)?

# I do not understand question #4 pg 156 advanced systems of equations?

I do not understand question #4 pg 156 advanced systems of equations?

# In question #10 of the backsolving chapter…

In question #10 of the backsolving chapter : in the xy plane, a line containing the points (a, a^3) and (10,40) passes through the origin. Which of the following could be the value of a?

I found the explanation in the answer key to be too time-consuming if I were to solve the equation with backsolving. Can you explain how to solve this question algebraically instead?

# Hi Mike, can you explain how to solve SAT 8, Section 3, #6 as a “system of equations?” Thanks.

Hi Mike, can you explain how to solve SAT 8, Section 3, #6 as a “system of equations?” Thanks.

# A question on polynomials practice question #10 (p. 149 in PWN the SAT Math Guide)…

A question on polynomials practice question #10 (p. 149 in PWN the SAT Math Guide): I understand how to solve using polynomial long division but can you explain your shortcut from the answer explanation? How would we know to plug in -3?

# On page148, what does it mean when question 3 states,”[i]f r(x) is divisible by x?” Is this mentioned else where in the book?

On page148, what does it mean when question 3 states,”[i]f r(x) is divisible by x?” Is this mentioned else where in the book?