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KatRina [158]
4 years ago
5

scooby made 70 percent on his science test. if he got 21 problems correct how many problems are on the test

Mathematics
1 answer:
JulijaS [17]4 years ago
7 0
Since the score is 21 out of an unknown number, and the percantage is 70%, you set .7 equal to the score (21/x), and solve for x

.7 = 21/x

Multiply both sides by x

.7x = 21

Divide both sides by .7

x = 30
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A unicycle wheel has a diameter of 12 inches. How many inches will the unicycle travel in 4 revolutions? Use π = 3.14 and round
Natali [406]

Answer:

226.19 inches in 6 revolutions.  

Step-by-step explanation:

Diameter of the unicycle's wheel=12 inches  

The distance traveled by the unicycle in one revolution is the circumference of the wheel.  

For a circle of diameter d,  

Circumference  

Therefore, Circumference of the Unicycle's wheel  inches  

Since the distance traveled in one revolution= inches  

Distance traveled in 6 revolutions=6 X  inches  

=226.19 inches (to the nearest hundredth of an inch.)

A unicycle wheel is a one wheeled device, unlike the bicycle which has two wheels.  

The given unicycle has a diameter, D, of 12 inches. It's radius, r, can be determined by;

 r =  

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∴        r = 6 inches.

A revolution is a complete movement of a point forming a circle, or the movement of a point along the circumference of a circle.  

Circumference of a circle = 2r  

Thus,  

the circumference of the wheel = 2 ×  × 6  

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The circumference of the wheel is 37.7143 inches.  

Therefore, for 6 evolutions the unicycle would travel:

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The unicycle would travel 226.29 inches in 6 revolutions

8 0
3 years ago
A 300$ mountain bike is discounted by 30% and then an additional 10% for shoppers who arrive before 5:00 am.Find the sales price
likoan [24]

Answer:

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6 0
4 years ago
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viktelen [127]
-c + d

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Second, simplify. / Your problem should look like: -12.7 - 4.4
Third, simplify. / Your problem should look like: -17.1

Answer: -17.1 (A)

5 0
4 years ago
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