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cupoosta [38]
3 years ago
13

Sarah has run 108 miles over the last 15 days while preparing for an upcoming marathon. She ran either 6 miles a day or 8 miles

a day. During the 15 day period, how many days did Sarah run an 8 mile day? A) 6 B) 7 C) 8 D) 9 \
Mathematics
2 answers:
N76 [4]3 years ago
8 0
<span>D) 9 is the correct answer from Usatestprep.</span>
Leona [35]3 years ago
4 0

Solution:

we are given that

Sarah has run 108 miles over the last 15 days while preparing for an upcoming marathon. She ran either 6 miles a day or 8 miles a day.

we have been asked to find

During the 15 day period, how many days did Sarah run an 8 mile day?

Let she ran 8 miles for x days, it mean she ran 6 miles one each of the (15-x) days. Then we can write

8x+(15-x)6=108\\\\\text{we can simplify it as below}\\\\8x+90-6x=108\\\\2x=108-90\\\\2x=18\\\\x=9\\

Sarah run an 8 mile day for 9 days.


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Lubov Fominskaja [6]
E’(5,-2)
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Please check if I understand the question correct

3 0
3 years ago
23,24 and 25 please! Thank you!!
Brut [27]

Answer:

it is too hard, You can caculator with each part.

example:

23, atrigle

24, cricle

25 atrigle

Step-by-step explanation:

3 0
3 years ago
It was Robin's birthday and she knew she was going to have a good day. She was driving to work, and when she turned on the radio
Andreas93 [3]

Answer:

1.Random circumstance: Color of traffic light when Robin approaches the main intersection. Possible outcomes: Traffic light is green when Robin arrives, or Traffic light is not green when Robin arrives.

2.Random circumstance: Song on the radio when first turned on. Possible outcomes: Robin's favorite song is playing, or Robin's favorite song is not playing.

4.Random circumstance: Nearest available parking space. Possible outcomes: Robin finds an empty parking space in front of the building, or Robin does not find an empty parking space in front of the building.

Step-by-step explanation:

A random circumstance is one whose outcome cannot be predicted because we either do not have the full details of the matter or it has not been confirmed yet by a reliable source. In the short description of events provided above;

1.The color of the traffic light is unpredictable because it is not under the control of the drivers but is automated.

2. Robin's favorite song playing on the radio is a random circumstance because she has no control over what song is played. So, she might as well have tuned in and it would be her least favorite song playing.

3. Robin driving into the office and finding the parking space empty is a random circumstance because it is not predictable. She might have come in and found the entire space filled.

7 0
3 years ago
Can someone help me plzzz?
vivado [14]
Lol im not doing your summer hw do it yourself

8 0
4 years ago
Will give brainliest, thanks, and 5 stars! LOTS OF POINTS! 50 POINTS!
lubasha [3.4K]

Answer in order:

False

True

False

False

False

False

False

True

True

Step-by-step explanation:

All of the solutions to the equation3x^2 - 12 = 0are x = 12 and x = -12

Solve:

Common factor - 3(x^2-4)=0

Divide both sides

x^2-4=0

Use the quadratic formula

x=\sqrt{4,x}=\sqrt{-4

x = 2, x = -2

Thus, This is false..

-------------------------------------------------------------------------------------------------------------

There are two unique solutions to the equations (x-3)^2 = 16

one variable in matrix = one possible value.

Therefore, x = 7, x = -1

Hence this is True

-------------------------------------------------------------------------------------------------------------

The solutions for the equation 2(x-3)^2-18 = 0 are x = 6 and x = 0

2x^3-18x^2+54x-72=0

x=5.080084

Hence this is false

-------------------------------------------------------------------------------------------------------------

The solutions for the equation 2(x-5)^2-8=0 are x = 7 and x = -7

Add both sides by 8

2(x-5)^2-8+8=0+8

2(x-5)^2=8

(x-5)^2=4

x = 7, x = 3

Hence, this is false

-------------------------------------------------------------------------------------------------------------

The solutions for the equation (x + 3)^2-25 = -8 are x = 2 and x = -8

(x+3)^2=17

x=\sqrt{17-3,}=-\sqrt{17}-3

Hence this is false.

-------------------------------------------------------------------------------------------------------------

The solutions for the equation 2(2x-1)^2=18 are x = 5 and x = -4

(2x-1)^2=9

x=2, x = -1

Hence this is false.

-------------------------------------------------------------------------------------------------------------

The only solution for equation (2x-1)^2-49=0 is x = 4

(2x-1)^2=49

x = 4, x = -3

Hence, this is false

-------------------------------------------------------------------------------------------------------------

The solutions for the equation 3(x+2)^2 - 3 = 0 are x = -3 and x = -1

3(x+2)^2=3

(x+2)^2=1

x = -1, x = -3

Hence, this is true

-------------------------------------------------------------------------------------------------------------

The solutions for the equation 5x^2 - 180 = 0 are x = 6 and x  = -6

Add 180 to both sides

5x^2-180+180=0+180

5x^2 = 180

x^2 = 36

x=\sqrt{36},x=-\sqrt{36}

x = 6, x = -6

Hence, this is true.

-------------------------------------------------------------------------------------------------------------

[RevyBreeze]

7 0
3 years ago
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