DIGITAL SAT MATH PROBLEMS AND SOLUTIONS
(Part - 3)

Problem 1 :

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The table above shows the exponential growth of a type of yeast over time s, in seconds. There are c total yeast colonies on the count plate. What is the equation that represents this relationship, assuming that no yeast was added or removed after counting began?

A)  c = (1 + 3)s

B)  c = (1 + 5)s

C)  c = 3(1 + 5)s

D)  c = 5(1 + 3)s

Solution :

Problem 2 :

The equations 12x = y and 24x + 7 = 2y intersect at how many points when graphed in the xy-plane?

A)  0

B)  1

C)  2

D)  7

Solution :

Problem 3 :

Several tiles labeled with either an A or a B are placed in a bag, and tiles are worth a different point value depending on the label. The equation 15a + 10b = 100 represents the situation when a of the A tiles and b of the B tiles are drawn from the bag for a total of 100 points. How many points would be earned by drawing one A tile and one B tile from the bag?

Solution :

Problem 4 :

The amount of money remaining in a scholarship fund is reduced by one-fourth every year. The amount of money in the fund is represented by d and the number of years by y. If the fund starts with $10,000, which equation below represents this situation after y years?

Solution :

Problem 5 :

What is the diameter, in millimeters (mm), of a cylinder
with a volume of 144π mm3 and a height of 4 mm?

A)  6

B)  9

C)  12

D)  36

Solution :

Given : Volume of the cylinder is 144π mm3.

Formula to find volume of a cylinder is πr2h, where r is  the radius and h is height of the cylinder.

Then, we have

πr2h = 144π

Divide both sides by π.

r2h = 144

Substitute h = 4.

r2(4) = 144

Divide both sides by 4.

r2 = 36

Taking square root on both sides,

r = 6

Diameter = 2 x radius

= 2 x 6 mm

= 12 mm

The correct answer choice is (C).

Problem 6 :

If n3 = x and n4 = 20x, where n > 0, what the value of x?

Solution :

n3 = x ----(1)

n4 = 20x ----(2)

Let's take (2).

n4 = 20x

n3 + 1 = 20x

n3 ⋅ n= 20x

n3 ⋅ n = 20x

Substitute n3 = x, from (1).

⋅ n = 20x

Divide both sides by x.

n = 20

Substitute n = 20 in (1).

203 = x

20 ⋅ 20 ⋅ 20 = x

8000 = x

Problem 8 :

The table shows selected values from function f.

digitalsatmath400.png

Which of the following is the best description of function f ?

A)  Decreasing linear

B)  Increasing linear

C)  Decreasing exponential

D)  Increasing exponential

Solution :

In the table above, the value of x increases at a constant rate by 1. Correspondingly, f(x) increases at a constant rate by 1. In a function, if both x and f(x) increase at a constant rate (not necessarily in the same rate), then it is increasing linear.

The correct answer choice is (B).

Problem 9 :

digitalsatmath401.png

The graph of a system of linear equations is shown. The solution to the system is (x, y). What is the value of x?

Solution :

The solution to the given system of linear equations is point of intersection of the two lines. Since the two lines intersect at the point (4, 1), the solution is (4, 1).

(x, y) = (4, 1)

Therefore, the value of x is 4.

Problem 10 :

23, 27, 27, 32, 35, 36, 52

What is the range of the 7 scores shown?

Solution :

Formula :

Range = Largest Value - Smallest Value

In the given data, the largest value is 52 and the smallest value is 23.

Range = 52 - 23

= 29

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