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cluponka [151]
3 years ago
11

How to solve 3+5x=20+7x

Mathematics
2 answers:
Karo-lina-s [1.5K]3 years ago
4 0

3 + 5x = 20 + 7x

First subtract 20 to both sides

-17 + 5x = 7x

Next subtract 5x to both sides (we are trying to get x all in one side)

-17 = 2x

Divide 2 to isolate the x

-17/2 = x or -8.5 = x

borishaifa [10]3 years ago
3 0
First, you would combine like terms so you would - 5x from both sides and you should end up with 3=20+2x and then you would - 20 from both sides which would lead you with -17 = 2x and then you divide both sides by 2 and the answer should be...

8.5=x
tell me if i’m right!! i am only in 7th grade
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Could someone please help
Mumz [18]
5/2=40/16. You can try to cross multiply by 2 times 40 and dividing by 16 to get 5.
6 0
3 years ago
Read 2 more answers
A student comes to lecture at a time that is uniformly distributed between 5:09 and 5:14. Independently of the student, the prof
scZoUnD [109]

Answer:

1/2

Step-by-step explanation:

The lecture has already begun when the student arrives means one of these scenarios happen:  

1) the class started at 5:10 and the student arrives at 5:11 or 5:12 or 5:13 or 5:14

2) the class started at 5:11 and the student arrives at 5:12 or 5:13 or 5:14

3) the class started at 5:12 and the student arrives at 5:13 or 5:14

Given student time of arrival is uniformly distributed, then the probability he/she arrives at 5:09 or 5:10 or 5:11 or 5:12 or 5:13 or 5:14 is 1/6.

So,  the probability that the student arrives between 5:11 and 5:14 is 1/6 + 1/6 + 1/6 + 1/6 = 2/3.

The probability that the student arrives between 5:12 and 5:14 is 1/6 + 1/6 + 1/6 = 1/2.

The probability that the student arrives at 5:13 or 5:14  is 1/6 + 1/6 = 1/3.

Given class starting time is uniformly distributed, then the probability it starts at 5:10 or  5:11 or 5:12 is 1/3.

Given the two events are independent, the probability of the first scenario is: (1/3)*(2/3) = 2/9

For the second scenario:  (1/3)*(1/2) = 1/6

For the third scenario:  (1/3)*(1/3) = 1/9

Because all of these scenarios are mutually exclusive the total probability of one of them happen is: 2/9 + 1/6 + 1/9 = 1/2

3 0
2 years ago
Denise likes 2 teaspoons of milk in every 8-ounce cup of coffee she drinks. How many teaspoons of milk does Denise like per ounc
borishaifa [10]
1/4 teaspoons of milk to ounces of coffee
5 0
3 years ago
The area of a certain rectangle is 288 yd2. The perimeter is 68 yd. What are the dimensions of the rectangle?
arsen [322]

Answer:

The rectangle is 16*18

Step-by-step explanation:

The area of a rectangle is length * width and the perimeter is 2 times length * width

A = l*w

P = 2(l+w)

Replacing A and P

288 = l*w

68 = 2(l+w) => 34 = l+w => 34 - w = l

replacing l in the area

288 = (34 - w) w

w^2 - 34w + 288 = 0

(w - 16)(w - 18)

w = 16

w = 18

replacing in 34 - w = l

you get that when w = 16, l = 18 and when w = 18, l = 16

8 0
3 years ago
Need the answer please and thank you
klasskru [66]
Hi there,

There appears to be no question....
3 0
3 years ago
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