3 years ago

If each time a student gets a good grade they get points but every bad point can

Mathematics

1 answer:

Olin [163]3 years ago

6 0

Answer:

They get 4 good points!

Step-by-step explanation:

21-17= 4:)

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The length of a rectangle is six times it’s width.If the area of the rectangle is 486 inches squared find its perimeter.

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3 years ago

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The volume of a triangular prism is 264 cubic feet. The area of a base of the prism is 48 square feet. Find the height of the pr

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3 years ago

Donna has a $300 loan through the bank she is charged a simple rate The total interest she paid on the loan was $63 As a percent

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21%

Step-by-step explanation:

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2 years ago

Researchers asked 250 families whether or not they were homeowners and how many cars they had. Their responses are summarized in

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3 years ago

Question Help

lorasvet [3.4K]

Answer:

The speed of the boat is 20 km/hr

Step-by-step explanation:

Let s be the speed of boat in still water

Let d be the distance

Upstream speed = s-4

Jane took 30 min to drive her boat upstream to water-ski at her favorite spot.

So, Distance traveled in upstream = $Speed \times time =(s-4) \times \frac{30}{60}$

Downstream speed = s+4

So, Distance traveled in downstream = $Speed \times time =(s+4) \times \frac{20}{60}$

So, $(s-4) \times \frac{30}{60}=(s+4) \times \frac{20}{60}$

30s-120=20s+80

10s=200

s=20

Hence The speed of the boat is 20 km/hr

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2 years ago