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Dima020 [189]
3 years ago
12

If 100 pencils can be sold for $90, then how many pencils are needed to earn $8500?

Mathematics
1 answer:
ira [324]3 years ago
5 0

Step-by-step explanation:

You can set up a proportion.

Let x be the number of pencils needed.

\frac{100}{90} = \frac{x}{8500}

Solve for x.

x = 9444.44 pencils (round it up to 9445 pencils if you need a whole number)

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Find the value of y.<br> Picture below
olga2289 [7]

We have trapezoid with congruent legs.

30x + 11y = 2x + 3

28x +11y = 3

Also we have

30x + 11y = 12

We got 2 equations:

30x + 11y = 12

28x +11y = 3 (*-1) -----> -28x -11y = -3

30x + 11y = 12

<u> -28x -11y = -3</u>

2x = 9

x=9/2

30x + 11y = 12 ------> 30*9/2 +11y =12 ------> 135+11y =12, ---> 11y = - 123,

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6 0
3 years ago
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EastWind [94]

Answer:

The answer and steps are in the picture below

Step-by-step explanation:

7 0
2 years ago
Using the net below, find the surface area
polet [3.4K]

Answer:

56 cm^2

Step-by-step explanation:

Surface area is just finding the areas of each face in a figure. As we are given a net of a figure, it is much easier for us to calculate it.

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4^2 = 16 cm^2

Area of ONE triangular face (1/2 x b x h):

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Multiply that by 4 because we have 4 triangular faces: 10 cm^2 x 4 = 40 cm^2

ADD all the areas of triangles and square:

16 cm^2 + 40 cm^2 = 56 cm^2

HOPE THIS HELPS

Have a nice day!

4 0
2 years ago
Triangle ABC maps to triangle A′B′C′ by a 90∘ rotation counterclockwise about the origin.
Tresset [83]
The answer is 90 units hope this helps
7 0
3 years ago
The length of a rectangle is 3 feet longer than the width. The perimeter is 30 feet. Find the length and width of the rectangle.
barxatty [35]

Answer:

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Step-by-step explanation:

9+9=18

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5 0
3 years ago
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