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Alex787 [66]
2 years ago
11

Telll me if I’m right please! No links

Mathematics
1 answer:
Minchanka [31]2 years ago
3 0
I believe you’re correct, because the formula of volume is length times width times height. Brainliest?
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**30 POINTS**
leonid [27]

Answer:....

What?

Step-by-step explanation:

7 0
3 years ago
Please help I need this done quickly with the work
myrzilka [38]

Answer:

8x - 7.

Step-by-step explanation:

f(x) = 2x - 5,

g(x) = 4x -1,

substituting g(x) as x in f(x),

f(g(x)) = 2(4x - 1) - 5

= 8x - 7

4 0
3 years ago
M so tried and braindead so plz hlp me
padilas [110]
The answer is D

explanation:
4 0
3 years ago
Read 2 more answers
PLS HELP WITH THESE THREE NO LINKS
Westkost [7]

Answer:

1. 6/15, 0.4, 40%

2. 0.15, 15%

3. 18 green marbles

Step-by-step explanation:

3 0
2 years ago
Answer as many as possible please need work for brainilist
zysi [14]

Answer:

1. 18x + 35y = 598

  x + y = 20

  Isolate a variable in the second equation:

  y = -x + 20

  Plug y back into the first equation

  18x + 35(-x + 20) = 598

  18x - 35x + 700 = 598

  -17x +700 = 598

  -17x = -102

   x = 6

   <u>You carpool 6 days of the 20</u>

   6 + y = 20

   y = 14

   <u>You ride the bus 14 days of the 20</u>

2.   4.50n + 3p = 252

     p = 2n

     Substitute p into the first equation

     4.50n + 3(2n) = 252

     4.50n + 6n = 252

      10.5n = 252

      n = 24

      <u>They sold 24 cans of nuts</u>

      p = 2(24)

      p = 48

      <u>They sold 48 boxes of popcorn</u>

      <u>The group sold, in total, 24 + 48 = 72 cans of nuts and boxes of popcorn. </u>

3.  x - y = 3

    x + y = 8

    Isolate a variable

    x = y + 3

    (y + 3) + y = 8

    2y + 3 = 8

    2y = 5

    y = 2.5

    <u>The average speed with wind is 2.5 mph</u>

    x - 2.5 = 3

    x = 5.5

    <u>The average speed without wind is 5.5mph </u>

4. x + 8y = 22.8

   x + 6y = 18.6

   Isolate

   x = -8y + 22.8

   Substitute

   (-8y + 22.8) + 6y = 18.6

   -2y + 22.8 = 18.6

   -2y = -4.2

   y = -2.1

   <u>The gas costs $2.10 per gallon</u>

    x + 8(2.1) = 22.8

    x + 16.8 = 22.8

    x = 6

    <u>The cost of the car was is $6. </u>

5.  Cost = 9.99 + 2.49x

    Cost = 20.49 + 1.79x    

    To find which one is better, we need to set them equal to each other at first.

    9.99 + 2.49x = 20.49 + 1.79x

    9.99 + 0.70x = 20.49

    0.70x = 10.5

    x = 15

So, they cost the same at 15 rentals.

To find which one is the better deal let's see how much both cost after 16 rentals.

     Cost = 9.99 + 2.49(16)

              = 49.83

     Cost = 20.49 + 1.79(16)

              = 49.13

<u>Therefore, Main Street is the better deal because after the equilibrium Main Street costs less than Big Video. </u>

6.  x + y = 15

    .25x + .05y = 2.75

    Isolate

    x = -y + 15

    Solve

    .25(-y + 15) + .05y = 2.75

    -.25y + 3.75 + .05y = 2.75

    -0.2y + 3.75 = 2.75

    -0.2y = -1

    y = 5

    <u>There are 5 nickels</u>

     x + 5 = 15

     x = 10

     <u>There are 10 quarters</u>

7. x + y = 26

   x + .25y = 17

   Isolate

   x = -y + 26

   Substitute

   (-y + 26) + .25y = 17

   -0.75y + 26 = 17

   -0.75y = -9

   y = 12

   <u>There are 12 quarters in his pocket</u>

   x + 12 = 26

   x = 14

   <u>There are 14 dollars </u>

<em>I hope this helps!!</em>

<em>- Kay :)</em>

6 0
2 years ago
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