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bekas [8.4K]
3 years ago
12

A study found that there is no direct relationship between the time that 8th-grade students spend brushing their teeth and their

final math grade for the year.
What is the correlation?

A.) negative
B.) positive
C.) no correlation
Mathematics
1 answer:
Elza [17]3 years ago
7 0

Answer:

c

Step-by-step explanation:

no correlation, because there's no direct relationship

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He radius of a circle is 2 kilometers. What is the area of a sector bounded by a 45° arc?
faust18 [17]
We know that
area of a circle=pi*r²
for r=2 km
area of a circle=pi*2²-----> 12.56 km²

if 360° (full circle) has an area of---------> 12.56 km²
 45°---------------------------------> x
x=45*12.56/360-----> x=1.57 km²

the answer is
1.57 km²
7 0
3 years ago
Look at the equation below <br> a=7b <br> If b=5, what is a?
Lynna [10]

Answer:

D, 35

Step-by-step explanation:

7b, if b=5, is the same as 7(5), or 7*5, which equals 35.

8 0
3 years ago
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Answer:

I would love to help!!

Step-by-step explanation:

7 0
3 years ago
Can someone at least help me with this one... the bottom empty one...
Varvara68 [4.7K]
157 is equal to half of the circumference...

C=2πr so C/2 is:

πr=157

r=157/π ft

r≈50 ft
6 0
3 years ago
A 2-kg toy car accelerates from 0 to 5 m/s. How much work is done?
Viktor [21]

The work is the difference between the final and initial kinetic energy:

W=\Delta K = \dfrac{1}{2}mv^2_f-\dfrac{1}{2}mv^2_i=\dfrac{1}{2}m(v^2_f-v^2_i)

Substitute your values to get

W=\dfrac{1}{2}\cdot 2(25-0)=25

7 0
4 years ago
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