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Irina18 [472]
3 years ago
5

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.
Complete the following statement:

As the time that students spend brushing their teeth decreases, their corresponding final math grades ________________.

A.) increase
B.) decrease
C.) cannot be predicted
Mathematics
2 answers:
DENIUS [597]3 years ago
8 0
C) cannot be predicted
KonstantinChe [14]3 years ago
6 0
I believe it’s C it cannot be predicted
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A kangaroo hops 2 kilometers in 3 minutes. At this rate:
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It takes 7 minutes and 30 seconds to travel 5 kilometers because first you divide 3 and 2 to figure out how many minutes is 1 kilometer and you get 1.5 then you multiply 5 and 1.5 to get the minutes of 5 kilometers. Also the kangaroo travels 1.3 kilometers in 2 minutes
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A 120° sector of a circle has an area of 67 cm². To the nearest centimeter what is the diameter of the circle?
qaws [65]

Answer:

degree = 120°

A =67 cm²

d=?

note : diameter= 2×radius

area of a circle = πr²

67=22/7 ×r²

67×7=22r²

469=22r²

r²=469/22

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r=4.62

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3 years ago
Keisha the trainer has two solo workout plans that she offers her clients: Plan A and Plan B. Each client does either one or the
gregori [183]

Answer:

Plan A last 0.75 hours or 45 minutes.

Plan B last 1.5 hours or 90 minutes.

Step-by-step explanation:

Let a be the number of hours that the plan A last, an b the number of hours of plan B. Then for the Wednesday you have:

2a+3b=6

And for the Thursday is:

6a+5b=12

Multiply the equation of Wednesday by -3:

-6a-9b=-18

Using the method of addition using this last equation and the equation of Thursday

-6a-9b=-18\\6a+5b=12\\--------\\-4b=-6\\b=\frac{-6}{-4}\\b=1.5 hours

Replacing the value of b in one of the equations

6a+5b=12\\6a+5(1.5)=12\\6a+7.5=12\\6a=12-7.5\\a=\frac{4.5}{6} \\a=0.75hours

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3 years ago
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You have to figure out X by going one through 10 Once you figure it out you multiply 4 times that number and then you subtract one and you’ll get seven like 4 x 2= 8-1= 7
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Compare the y-intercepts and the rates of change of the following items.
marysya [2.9K]

Answer:

The answer is C: They are all the same.

8 0
3 years ago
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