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3 years ago

How do you solve fractions and multiplication in algebraic, ex:1/3× -4

Mathematics

1 answer:

Setler79 [48]3 years ago

3 0

Answer: x=12

Step-by-step explanation:

1/3 x -4

1/3x=4 <---- First add 4 to each side of the equation (moves the "-4")

1/3x(3)=4(3) <---- Muliply each side by "3" to get rid of the fraction

x=12

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4 years ago

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The circumference of a circle is 30t. What is its area?

labwork [276]

Answer:

$A=\frac{225t^2}{\pi}$ given the circumference is 30t.

Step-by-step explanation:

The circumference of a circle is $C=2\pi r$ and the area of a circle is $A=\pi r^2$ assuming the radius is $r$ for the circle in question.

We are given the circumference of our circle is $2 \pi r=30t$ .

If we solve this for r we get: $r=\frac{30t}{2\pi}$ . To get this I just divided both sides by $2\pi$ since this was the thing being multiplied to $r$ .

So now the area is $A=\pi r^2=\pi (\frac{30t}{2 \pi})^2$ .

Simplifying this:

$A=\pi (\frac{30t}{2 \pi})^2$ .

30/2=15 so:

$A=\pi (\frac{15t}{\pi})^2$ .

Squaring the numerator and the denominator:

$A=\pi (\frac{(15t)^2}{(\pi)^2}$

Using law of exponents or seeing that a factor of $\pi$ cancels:

$A=\frac{(15t)^2}{\pi}$

$A=\frac{15^2t^2}{\pi}$

$A=\frac{225t^2}{\pi}$

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3 years ago

Pls help I will award brainliest

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Answer:

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3 years ago

Hannah received $30 for her birthday and bought 3 shirts that were all the same price. If she had $9 left over, which equation s

Natasha2012 [34]

Money spent + money left over = total money

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We don't know the price of each shirt, so let x = price of 1 shirt.
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3 years ago

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You are choosing between two different cell phone plans. The first plan charges a rate of 25 cents per minute. The second plan c

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Answer:You would have to use over 200 minutes in a month in order for the second plan to be preferable.

Step-by-step explanation:

Let x represent the number of minutes that you use in a month.

The first plan charges a rate of 25 cents per minute. It means that the cost of using x minutes in a month with this plan is 0.25x.

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29.95 + 0.1x

For the second plan to be preferable, its cost would be lesser than the first plan. Therefore,

29.95 + 0.1x < 0.25x

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29.95 < 0.15x

0.15x > 29.95

x > 29.95/0.15

x > 200

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3 years ago

How do you solve fractions and multiplication in algebraic, ex:1/3× -4​

How do you solve fractions and multiplication in algebraic, ex:1/3× -4