You can check it by solving it in your head. They are separating at the rate of 55-40 or 15 miles per hour. So in 1 hour or 60 minutes they'll be 15 miles apart, so in 20 minutes they'll be 5 miles apart, so in 40 minutes they'll be 10 miles apart. So it has to be 40 minutes.

Step-by-step explanation:

55t-40t=10

15t=10

15t/15=10/15

2/3

40 Minutes

3 0

3 years ago

You time someone completing a single task the first time at 100 minutes and the fourth time they do the task it takes 81 minutes

kolezko [41]

Answer:

given statement is false

Step-by-step explanation:

given data

first time = 100 minutes

fourth time = 81 minutes

solution

as here time for 1st unit is multiply by learning percentage for obtain time for 2nd unit

so here time for 2nd unit divide by time of 1st unit so 100 is here learning curve

so $\frac{81}{100}$ × 100 = 81 percent

but it say 90 percent learning curve

so given statement is false

3 0

3 years ago

John says that if one side of an inequality is 0, you don't have to reverse the inequality symbol when you multiply or divide bo

Jobisdone [24]

It doesn't matter if there is 0, you still flip the inequality symbol.
-3z <span>≥ 0
z </span>≤ 0

6 0

3 years ago

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