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If (D) is the distance traveled and (R) is the rate of travel, which of the following represents the relationship between D and R for the equation D=2R?

A. D is twice as much as R

B. R is twice as much as D

C. R is two than D

D. D is town more than R

Answer Explanation:

Given the equation D=2R means that the get the value of D, multiply the value of R by 2. That is D is two times the value of R.

Therefore, the Correct Answer is A.

Q #1: (x/y)-z=rw Solve for x in the equation above.

A. X=y(z+rw)

B. X=rw(y-z)

C. X=rwy+z

D. X=rwy-z

Answer Explanation

Given the equation (x/y)-z=rw, we make x the subject of the formula as follows:

(x/y)-z=rw

Add z to both sides of the equation

(x/y)-z+z=rw+z

(x/y)=rw+z

Multiply both sides by y

(x/y)*y=y(rw+z)

X=y(rw+z)

Rearranging the equation results in:

X = y(z+rw)
Q #2: The table shows healthcare spending per capita in a group of African nations. Based on this information, which of the following countries had the greatest change in dollars spent per capita from 2013 to 2015?

A. Eritrea

B. Sudan

C. Tanzania

D. Kenya

Answer Explanation

To find a solution to this, we need to find the change in spending between the year 2013 and 2015 for each country. Change is difference in amount spent in 2015 and 2013 for each country:

Sudan=$(24-17)= $7

Eritrea=$(42-56)= - $14

Nigeria = $(21-16)= $5

Tanzania =$(81-68) = $13

Rwanda = $(24-27) =-$3

Kenya = $(88-81) = $8

A Minus sign means a decrease in spending. From the above calculations, Eritrea had the GREATEST change in dollars spent while Rwanda had the LEAST change in dollars spent.
Q #3: Which of the following is 31% of 426?

A. 425.69

B. 132.06

C. 13.7

D. 0.07

Answer Explanation

First convert 31% to a decimal before working on the problem

31%=31/100=0.31

Thus, 31% of 426=0.31*426=132.06

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