Question 15 of 20 :
select the best answer for the question
15. a student received a 75% on an exam. if there were 20 questions on the exam, which
ratio would show the number of questions answered correctly to the total number of
questions?
rams
o a. 15: 20
o b. 20: 15
o c. 5: 20
o d. 20: 5
mark for review (will be highlighted on the review page)
< < previous question
next question > >

A

Step-by-step explanation:

75% is 3/4. 20:4*3=15. Which means that he answered 15 questions. 15 out of 20.

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

read more on -

step-by-step explanation:

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."