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#### Hello! For question #8 on page 111…

October 18, 2020#### Hi! For question #9 on page 111…

October 18, 2020Hi! 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…

October 13, 2020If 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…

September 30, 2020If 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…

September 28, 2020In 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!

September 28, 2020Hi – 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?

September 21, 2020Can 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

September 21, 2020COLLEGE 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?