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Nataly [62]
2 years ago
5

Please help me with this???

Mathematics
1 answer:
devlian [24]2 years ago
4 0

Answer:

Step-by-step explanation:

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Which of the following diagrams represents 80%?<br><br>Help please. it'd be very appreciated. :)​
Alenkasestr [34]

Answer:

H

Step-by-step explanation:

there is 10 parts to the shape so your denominator would be 10 then if you count the shaded area there's 8, so 8 would be your numerator

8/10 = 0.8 or 80%

5 0
3 years ago
A racing shell, which is a boat a crew team rows, moves 20 km/h in still water. During practice, the team rows 36 km against the
saveliy_v [14]

Answer:

2 km/h

Step-by-step explanation:

Let x represent the speed of the river current, t₁ be the time spent rowing against the current and t₂ be the time spent rowing with the current.

Since the speed of the still water = 20 km/h.

The speed of rowing against the current = (20 - x)

The speed of rowing with the current = (20 + x)

We know that velocity = distance / time. Hence time = distance / velocity

t₁ = 36 / (20 - x)

t₂ = 22 / (20 + x)

but t₁ + t₂ = 3 hours

Therefore:

3 = 36 / (20 - x) + 22 / (20 + x)

multiply through by 400 - x²

3(400 - x²) = 36(20 + x) + 22(20 - x)

1200 - 3x² = 720 + 36x + 440 - 22x

3x² + 14x -40 = 0

This gives x = -6.7 or x = 2

x cannot be negative therefore x = 2 km/h

The speed of the river current is 2 km/h

4 0
3 years ago
Read 2 more answers
Find the constant of variation for the relation and use it to write an equation for the statement. Then solve the equation.
harina [27]

Answer:y=15/4

Step-by-step explanation:

start with general form y = kx. substitute in the pair of values you know for x and y.

75/8 = k(5) multiply both sides by 1/5 to solve for k, getting

15/8 = k

So your equation is y = (15/8)x substitute 2 for x to find your new y.

y = (15/8)2

y = 15/4

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3 years ago
Each gallon of shingle stain covers 120 square feet. How many gallons should you buy to cover 658 square feet?
hjlf
You need to divide 658 by 120 because you know one gallon covers 120 square feet.
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Find the price of a $200 pair of shoes with a 6% Sale tax
Gre4nikov [31]
You multiply the price by 1.06 to get the total cost with tax. That amount is $212
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2 years ago
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