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bogdanovich [222]
3 years ago
15

Given that

Mathematics
2 answers:
svetoff [14.1K]3 years ago
4 0

Answer:

-7

Step-by-step explanation:

To find x, substitute the values and solve.

R = 2x + 9y

It becomes:

2x  + 27 = 13

Rearrange and solve

2x = -14

x = -7

Hope this helps

trasher [3.6K]3 years ago
3 0

Answer:

x=-7

Step-by-step explanation:

We are given the expression:

R=2x +9y

We want to find x when R=13 and y=3. Therefore, we must substitute the numbers in for the variables.

13=2x+9(3)

Multiply 9 and 3.

13=2x+27

Now we must solve for x by isolating x on one side of the equation.

27 is being added to 2x. The inverse of addition is subtraction, so subtract 27 from both sides.

13-27=2x+27-27

13-27=2x

-14=2x

x is being multiplied by 2. The inverse of multiplication is division, so divide both sides by 2.

-14/2=2x/2

-14/2=x

-7=x

x=-7

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VLD [36.1K]

Answer:

  y = (∛x)/3

Step-by-step explanation:

To undo the multiplication by 27, you multiply by its inverse:

  (1/27)y = (1/27)(27x^3)

  y/27 = x^3 . . . . . . . . . . . simplify

To undo the cube, you take the cube root:

  (∛y)/(∛27) = ∛(x^3)

  (∛y)/3 = x

Apparently, you want the inverse function, so you swap the variables:

  y = (∛x)/3

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You can swap the variables at the beginning or end. It doesn't matter. If you do it at the beginning, you have ...

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7 0
3 years ago
-3 \cdot f(-8) + 7 \cdot g(2) =−3⋅f(−8)+7⋅g(2)=minus, 3, dot, f, left parenthesis, minus, 8, right parenthesis, plus, 7, dot, g,
dsp73

Answer:

-22

Step-by-step explanation:

The graph from which the information is to be read is attached below.

We want to find the value of −3⋅f(−8)+7⋅g(2).

From the graph:

  • f(-8)=-2
  • g(2)=-4

Therefore:

−3⋅f(−8)+7⋅g(2)=−3(-2)+7(-4)

=6-28

=-22

−3⋅f(−8)+7⋅g(2)=-22

3 0
3 years ago
What is the area of a parallelogram with a base of 38 meters and a height of 12 meters?
8090 [49]

For this case we have by definition that the area of a parallelogram is given by:

A = b * h

Where:

b: It's the base

h: It's the height

According to the data we have:

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Substituting in the formula:

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The area of the parallelogram is A = 456 \ m ^ 2

Answer:

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4 0
3 years ago
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andrey2020 [161]

If there are 60 people waiting for a river raft ride. Each raft holds

15 people. how Silvia's work can be used to find the number

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<h3>Number of rafts needed</h3>

Using this formula

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The ratio of boys to girls in the classroom is 12:25 if there are 120boys how many girls are there​
Ann [662]
Call x is the number of girls in the classroom.
12/120 = 25/x
x = 120*25/12
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Answer 250 girsl
8 0
3 years ago
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