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3 years ago

1:X = X:81 what number can replace X?

Mathematics

1 answer:

anygoal [31]3 years ago

7 0

Multiply 1/x = x/81 by 81x and you get

... 81 = x²

Taking the square root gives

... x = ±9

Either 9 or -9 can replace X to make the proportion statement true.

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A business bought 500 lamps for $10,000. They want to mark them up 25%. What is the retail price of each lamp?

zavuch27 [327]

Answer:

$25 a lamp

Step-by-step explanation:

First divide $10,000 by 500 lamps to find how much one of them cost

That is $20 a lamp so then multiply .25 *20 or 1/4 *20

you get 5 than add 20 +5=25

8 0

3 years ago

Can you rearrange it so T is the subject

OverLord2011 [107]

The formula after making t subject of the formula is:

$t = \frac{2-3q}{q+4}$

Step-by-step explanation:

Given formula is:

$q = \frac{2-4t}{t+3}$

To make t the subject of the formula we have to isolate t

So,

Cross-multiplying

$q(t+3) = 2-4t\\qt+3q = 2-4t$

Adding 4t on both sides

$qt+3q+4t = 2-4t+4t\\qt+3q+4t = 2$

Subtracting 3q from both sides

$qt+3q+4t-3q = 2-3q\\qt+4t = 2-3q$

Taking t common on left hand side

$t(q+4)=2-3q$

Dividing both sides by q+4

$\frac{t(q+4)}{q+4}=\frac{2-3q}{q+4}\\t = \frac{2-3q}{q+4}$

The formula after making t subject of the formula is:

$t = \frac{2-3q}{q+4}$

5 0

3 years ago

Through: (-5,2), slope=-4/5

Oksana_A [137]

Answer:

Step-by-step explanation:

The point-slope form of an equation of a line:

$y-y_1=m(x-x_1)$

We have the slope m = -4/5 and the point (-5, 2). Substitute:

$y-2=-\dfrac{4}{5}(x-(-5))\\\\y-2=-\dfrac{4}{5}(x+5)$

7 0

3 years ago

How to convert 655.575 to word form?

zhuklara [117]

655.575 = Six hundred fifty five point five seven five.
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Keep up the good work and stay FILLED WITH DETERMINATION!

4 0

4 years ago

4-7x +3 +5x pleas help thanks

meriva

Answer:

7−2x

Step-by-step explanation:

1 Collect like terms.

(4+3)+(-7x+5x)

(4+3)+(−7x+5x)

2 Simplify.

7-2x

7−2x

3 0

3 years ago

Read 2 more answers