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Dovator [93]
3 years ago
10

Tell me the answer of these question.

Mathematics
1 answer:
Nonamiya [84]3 years ago
6 0
16. \ \ V= \pi r^2h \ \to \ r^2= \cfrac{V}{ \pi h}  \ \to \ \boxed{r= \sqrt{ \frac{V}{ \pi h} } } \\ \\ \\ 17.\ \ d= \frac{1}{2} at^2 \ \to \ 2d= at^2   \ \to \ t^2= \cfrac{2d}{a} \   \to \ \boxed{t= \sqrt{\frac{2d}{a}}} \\  \\   \\ 18. \ \ S=180(n-2) \ \to \  \cfrac{S}{180}=n-2 \ \to \ \boxed{n= \frac{S}{180}+2 }
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Mrs. Wright bought some notebook paper for her class. She decided to keep 3/4 of the paper for her own use. How much paper did s
larisa [96]
So the total amount of paper is 4/4 right?
And she kept 3/4.
So we have to minus 3/4 from 4/4.
Because it has the same denominator we need not change it to similar one.So 4-3 is one.
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5 0
3 years ago
How many inches are in 7 and 1/2 feet?
Over [174]

Answer:

90 inches

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4 0
3 years ago
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Elan Coil [88]
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5 0
3 years ago
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Express in Simper Fom : y-x
AveGali [126]
Simplify

E=\dfrac{\frac{x}{y}-\frac{y}{x}}{\frac{1}{y}+\frac{1}{x}}


Conditions for the existance of E:

x\neq 0~~\text{ and}~~y\neq 0~~\text{ and }~~x\neq -y.

(otherwise, the one of the denominators would be zero.)
____________________

Simplifying:

E=\dfrac{\frac{x}{y}-\frac{y}{x}}{\frac{1}{y}+\frac{1}{x}}


Multiply both the numerator and the denominator by xy:

E=\dfrac{xy\cdot \left(\frac{x}{y}-\frac{y}{x} \right )}{xy\cdot \left(\frac{1}{y}+\frac{1}{x} \right )}\\\\\\ E=\dfrac{\frac{xy\cdot x}{y}-\frac{xy\cdot y}{x}}{\frac{xy}{y}+\frac{xy}{x}}\\\\\\ E=\dfrac{x^{2}-y^{2}}{x+y}\\\\\\ E=\dfrac{(x+y)(x-y)}{x+y}


Simplify common factors:

E=x-y\\\\\\ \therefore~~\boxed{\begin{array}{c}\dfrac{\frac{x}{y}-\frac{y}{x}}{\frac{1}{y}+\frac{1}{x}}=x-y \end{array}}

6 0
3 years ago
If the original price is $80 and u discount 20%, what’s the sale price?
faust18 [17]
<h2>$64 is the correct answer!</h2>

80 x 0.2 = 16

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8 0
3 years ago
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