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belka [17]
3 years ago
8

Im going to give brainly plz help me thx i promise.

Mathematics
2 answers:
DIA [1.3K]3 years ago
8 0

17-31=31-17\quad :\quad \mathrm{False}

17-31=31-17

-14=14

\mathrm{The\:sides\:are\:not\:equal}

False

mina [271]3 years ago
5 0

Answer:

No, he is not correct.

Step-by-step explanation:

Subtracting 17 from 31 would be 14 but subtracting 31 from 17 would be -14 ( minus 14)

<em><u>Hope</u></em><em><u> </u></em><em><u>this</u></em><em><u> helps</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em>

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A collection of nickels and dimes is worth $9.45. If the number of dimes is doubled, the value is
eduard

Answer:

The number of nickels is 45 and the number of dimes is 72.

Step-by-step explanation:

Let

x ----> number of nickels

y ----> number of dimes

Remember that

1\ nickel=\$0.05

1\ dime=\$0.10

so

0.05x+0.10y=9.45 ------> equation A

0.05x+0.10(2y)=16.65

0.05x+0.20y=16.65 ------> equation B

<em>Solve the system by substitution</em>

we have

0.05x+0.10y=9.45 ------> equation A

0.05x+0.20y=16.65 ------> equation B

Multiply both equations by 100 both sides

5x+10y=945 ---->5x=945-10y --> equation C

5x+20y=1,665 ----> equation D

substitute equation C in equation D

(945-10y)+20y=1,665

solve for y

945+10y=1,665

10y=1,665-945

10y=720

y=72\ dimes

Find the value of x

5x=945-10y

5x=945-10(72)

5x=225

x=45\ nickels

<em>Alternative Method</em>

Solve the system by graphing

Remember that the solution is the intersection point both graphs

using a graphing tool

the solution is the point (45,72)

therefore

The number of nickels is 45 and the number of dimes is 72.

7 0
3 years ago
Need help quickly its hard
kaheart [24]

Answer:

1-3x+8y

Step-by-step explanation:

Multiply y and 2

Multiply y and 1

The y just gets copied along.

2*y evaluates to 2y

Multiply x and 4

Multiply x and 1

The x just gets copied along.

The answer is x

4*x evaluates to 4x

2*y-4*x evaluates to 2y-4x

The answer is 2y-4x+8

2*y-4*x+8 evaluates to 2y-4x+8

Multiply y and 6

Multiply y and 1

The y just gets copied along.

The answer is y

6*y evaluates to 6y

2y + 6y = 8y

The answer is 8y-4x+8

2*y-4*x+8+6*y evaluates to 8y-4x+8

-4x + x = -3x

The answer is -3x+8y+8

2*y-4*x+8+6*y+x evaluates to -3x+8y+8

8 - 7 = 1

The answer is 1-3x+8y

2*y-4*x+8+6*y+x-7 evaluates to 1-3x+8y

6 0
3 years ago
Guys help me this is hard​
Leokris [45]

Answer:

well 126/9=14 but is the other stuff factor families or something? like whats the question asking

Step-by-step explanation:

5 0
3 years ago
Barbara earns $492.00 per week. She is single and claims 1 allowance. Her state tax rate is 2.8 percent and her local tax rate i
Zarrin [17]
Her next pay is to me
3 0
3 years ago
$123.74856 rounded to the nearest cent would be?
Airida [17]
$123.75 you would round all of them to the nearest hundreth
3 0
3 years ago
Read 2 more answers
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