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3 years ago

Simplify the expression.

Mathematics

2 answers:

kramer3 years ago

8 0

$-\frac{7}{9} - \frac{5}{10}$
= $-\frac{70}{90} - \frac{45}{90}$
= $-\frac{115}{90}$
= $-\frac{23}{18}$ (Answer D)

Ne4ueva [31]3 years ago

5 0

Selection D is appropriate.

-14/18 -9/18 = -23/18

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$V=\dfrac{4}{3}\pi r^3\ \ \ |\cdot\dfrac{3}{4}\\\\\pi r^3=\dfrac{3V}{4}\ \ \ \ |:\pi\\\\r^3=\dfrac{3V}{4\pi}\ \ \ |:r\\\\r^2=\dfrac{3V}{4\pi r^2}$

Substitute to S.A.

$S.A.=4\pi r^2=4\pi\cdot\dfrac{3V}{4\pi r^2}=\dfrac{3V}{r}$

$\dfrac{S.A.}{V}=\dfrac{4\pi r^2}{\frac{4}{3}\pi r^3}=\dfrac{3}{r}$

$\dfrac{S.A.}{V}=1\to\dfrac{3}{r}=1\to r=3$

Answer: B

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Anestetic [448]

Answer:

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ehidna [41]

Its d,
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3 years ago

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scoundrel [369]

Answer:

2.75x + 114 = 320.25

x = $75

Step-by-step explanation:

2.75x + 114 = 320.25

number of hours of labor (2.75) times the cost per hour of labor (x) + cost of parts (114) = total cost (320.25)

2.75x + 114 = 320.25

subtract 114 from both sides

2.75x = 206.25

divide both sides by 2.75

x = 75

------------------------

check the math:

2.75(75) = 114 = 206.25 + 114 = 320.25

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3 years ago

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