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elena-s [515]
3 years ago
15

Simplify the expressions

Mathematics
1 answer:
NikAS [45]3 years ago
8 0


1). 8n-(n-3)

8n-n+3

7n+3


2). 20u-6(u+5)

20u-6u-30

14u-30


3).-w+4-(3w-13)

-w+4-3w+13

-4w+17


4). p-5(2-3p)+1

p-10+15p+1

16p-9

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Length of a rectangle is four times its width. If the perimeter is 100 m, what is the area in square cm?
melisa1 [442]

Set the width to be x. Thus, the length is 4x.

The perimeter is 2(x+4x)=100, so x=10.

Plugging in x=10, you get that 4x=40.

So, the area of the rectangle is 400 m^2.

Because there are 100 centimeters in a meter and you are asking for area, you must multiply by 100^2 to get 4000000 cm^2.


6 0
3 years ago
Simplify (9^2/3*9^4/2)/9^1/2
JulsSmile [24]

Answer:

\frac{9^{5}}{3}

Step-by-step explanation:

\frac{9^{2}}{3} * \frac{9^{4}}{2} = \frac{9^{6}}{6}\\\\\frac{\frac{9^{6}}{6}}{\frac{9^{1}}{2}} \\\\\frac{2*9^{6}}{6*9^{1}}\\\\\frac{9^{5}}{3}

\frac{9^{5}}{3} = 19,683

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3 years ago
If r^n=a, then which of the following are true statements? Check all that apply.
Vanyuwa [196]
A. This is correct. When you transfer n to the other side, that would be the reciprocal power of a.

b. This is incorrect, because this contradicts with choice a.

c. This is correct. When a number is raised to a "1/n" fraction, that is equivalent to the nth root of the number.

d. This is incorrect, because it is not equivalent to the given equation.

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Suppose 20 students delegates will attend the conference. Each school should be represented fairly in relation to it's populatio
algol [13]

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To find out the number coming from each school, you need to use the proportion of the school's population out of the population of all three.

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South Middle School:

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8 0
3 years ago
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