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3 years ago

How to do percentages ?

2 answers:

4 0

How to calculate percentages:

First, work out the difference between (increase) the two numbers you're comparing.

*Increase = New number - Original number*

Then, divide the increase by the original number and multiply the answer by 100.

*% increase = Increase divided by the Original number times 100.*

If your answer is a negative number than it is a percentage decrease. (You'd pretty much have to do the same thing that you do for the percentage increase except you'd get a positive number.)

Rus_ich [418]3 years ago

3 0

Say you're trying to figure out what percentage 3 is of 15.

3/15 = x/100

You would cross multiply so..

3(100) = 15x

Then simplify.

300 = 15x

300/15 = 15x/15

20 = x

Therefore, 3 is 20% of 15.

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2 years ago

|x - 1| > 4 is equivalent to which of the following?

Vsevolod [243]

Answer:

C. x > 5 or x < - 3

Step-by-step explanation:

|x - 1| > 4

Step 1:

x - 1 > 4

x > 4 + 1

x > 5

Step 2:

x - 1 < -4

x < -4 + 1

x < -3

HP: {x > 5 or x < -3} (c)

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2 years ago

Evita lives 0.85 miles from her school. Write this distance as a fraction in simplest form

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0.85 written as a fraction in simplest form is 17/20

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2 years ago

A bank receives a deposit for $30,000. If the bank has a 10 percent reserve requirement, approximately how much money could this

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Answer:300,000

Step-by-step explanation:

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3 years ago

Triangle ABC has vertices A(-3,0) B(0,6) C(4,6). Find the equations of the three medians of triangle ABC

Mariana [72]

Answer:

1. $y=-6x+6, y=\frac{6}{5} x+\frac{18}{5}, y=\frac{6}{11} x+\frac{42}{11}$

2. $y=-\frac{1}{2} x+2\frac{1}{4} , x=2, y=-\frac{7}{6}x+\frac{43}{12}$

Step-by-step explanation:

A(−3, 0), B(0, 6), and C(4, 6)

using the midpoint formula: $(\frac{x_1+x_2}{2}, \frac{y_1+y_2}{2})$ we can find all of their midpoint which is necessary to complete question 1 and 2

Mid AB=(-1.5, 3), Mid BC=(2, 6), Mid AC=(0.5,3)

Next, we have to find the slope of from the vertex and the midpoint of each side. We use the slope formula: $\frac{y_2-y_1}{x_2-x_1}$ .

You would get -6, 6/5, and 6/11.

Next you substitute in the coordinates for the equation of each for example: y=-6x, you switch in the set of cords AB which is (-1.5, 3). 3=-6(-1.5)+z and find that z=6, so the equation is y=-6x+6. As for the rest, repeat the same process until you find all 3 cords. You should get an answer of $y=-6x+6, y=\frac{6}{5} x+\frac{18}{5}, y=\frac{6}{11} x+\frac{42}{11}$

For question 2,

The line has to be perpendicular bisector to the midpoint, signifying that it has to split 2 angles into congruent angles and a side into half. In order to do that we need to first find the opposite reciprocal of each side's slope. Which means we need to once again use the slope formula and get the opposite reciprocal by $-\frac{1}{slope}$ . For all the opposite reciprocal slopes you get will be incorporated into the final formulas. That gives us the slopes of -1/2, 0 and -7/6. Then do the same process of matching cords with these incomplete equations and you can find the final equations of $y=-\frac{1}{2} x+2\frac{1}{4} , x=2, y=-\frac{7}{6}x+\frac{43}{12}$

I hope that helped with your question!! :)

Also I'm an RSM student too and I didn't know how to do them before so I searched it up.

6 0

2 years ago