15% of alina’s workout consisted of cardio exercise. 25% of dane’s workout consisted of cardio exercise. which statement must be true?
if they worked out for the same amount of time, dane did 10 more minutes of cardio exercise than alina.
if alina’s workout was 80 minutes, and dane’s workout was 48 minutes, they spent the same amount of time on cardio exercise.
if both workouts were 60 minutes, dane spent 8 more minutes on cardio exercise than alina did.
alina spent less time on cardio exercise than dane did.

If Alina’s workout was 80 minutes, and Dane’s workout was 48 minutes, they spent the same amount of time on cardio exercise.

Step-by-step explanation:

For option A,

If they both workout for minutes,

Alina's time is

and Dane's time is

The difference is

If they both work out for 100 minutes, then Dane did 10 more minutes of cardio exercise than Alina.

Since is not fixed, this statement is false.

For option B,

If Alina's work out  was 80 minutes, then she spent minutes on cardio exercise.

If Dane's work out  was 48 minutes, then he spent minutes on cardio exercise.

Hence both spent the same amount of time on cardio exercise.

The correct answer is option B

For option C,

If they both workout for minutes, then

Alina's time is

and Dane's time is

The difference is

If they both work out for 60 minutes, then Dane did 9 more minutes of cardio exercise than Alina and not 10.

This statement is false

For option D,

We cannot tell whether Alina spent more or less time than Dane,unless we know the time both spent for the entire work out.

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225