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kotykmax [81]
3 years ago
15

Susan drove 571 miles and the trip took 14 hours of driving time she wants to shorten her driving time by 1/2 hour what average

speed should she drive to do this?
Mathematics
1 answer:
Allushta [10]3 years ago
8 0

Answer: The answer is 80 mph.


Step-by-step explanation: 1. Divide 14 from 571.

2. You'll get the answer 40. So it's 40 mph.

3. If she's trying to shorten by 1/2 then she should drive 80 mph because if you drive 80 mph it will take 7 hours instead of 14 hours. (She'll go 7 hours because you divide 14 hours by 2. Then you have to multiply 2 to 40.)



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What is the measure of the sum of all angles in a regular dodecagon (12 sides)? What is the measure of one of its interiors angl
lana66690 [7]

Answer:

Part a) The measure of the sum  of all angles in a regular dodecagon is equal to 1,800 degrees

Part b) The measure of one of its interiors angles is 150 degrees

Part c) The measure of one of its exterior angles is 30 degrees

Step-by-step explanation:

Part a) What is the measure of the sum of all angles in a regular dodecagon (12 sides)

we know that

The formula to calculate the sum of the interior angles in a regular polygon is equal to

S=(n-2)180^o

where

n is the number of sides of regular polygon

In this problem a regular dodecagon has n=12 sides

substitute

S=(12-2)180^o

S=(10)180^o

S=1,800^o

Part b) What is the measure of one of its interiors angles?

To find out the measure of one of its interior angles, divide the sum of all angles by the number of sides

1,800^o/12=150^o

Part c) What is the measure of one of its exterior angles?

we know that

The sum of one interior angle and its corresponding exterior angle must be equal to 180 degrees

Let

x ---> the measure of one exterior angle

150^o+x=180^o

solve for x

x=180^o-150^o

x=30^o

8 0
3 years ago
(!!WORD PROBLEM!!)
Ivan

Answer: a package of cookies cost $ 5 and each bag of chips cost $5

Step-by-step explanation:

Let x represent the cost of a package of  cookies and y represent the cost of a bap of chips ,then from the first statement :

4x + 4y = 40

dividing through by 4 , we have

x + y = 10 ........................... equation 1

From the second statement

3x + 5y = 40  ..................... equation 2

Solving the system of linear equation by substitution method , from equation 1 , make x the subject of the formula , that is

x = 10 - y ................... equation 3

substitute x = 10 - y into equation 2 , we have :

3 (10 - y ) + 5y = 40

30 - 3y + 5y = 40

30 + 2y = 40

subtract 30 from both sides

2y = 40 -30

2y = 10

y = 5

substitute y = 5 into equation 3 , equation 3 becomes

x = 10 - 5

x = 5

Therefore ; a package of cookies cost $ 5 and each bag of chips cost $5

5 0
3 years ago
Plss help ASAP :))))))))))
GREYUIT [131]

Answer:

43in

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3 0
3 years ago
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The ratio of girls to boys in a student basketball league is 5:6. Juan says that there must be exactly 11 students in the league
Nikitich [7]

Answer:

She is correct.

Step-by-step explanation:

5:6 means that you add 5 + 6 = 11 which means that the answer is 11.

4 0
3 years ago
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mafiozo [28]

Answer:

opt 4

Step-by-step explanation:

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8 0
3 years ago
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