3 years ago

The sum of 9 is multiplied by -2 and the answer is 90. find my number

Mathematics

1 answer:

OLga [1]3 years ago

8 0

The number is 45 because 9 times 5 is 45 times -2 is 90

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In at least one complete sentence, describe in words which numbers are included in this

ikadub [295]

The numbers included in this interval are from -12/17 and on.

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2 years ago

Liquid A has a density of 0.7g/cm^3

TiliK225 [7]

$\rho = \frac{m}{V} \Rightarrow V=\frac{m}{\rho}$
ρ - density, m - mass, V - volume

Liquid A:
$\rho=0.7 \ \frac{g}{cm^3} \\
m=140 \ g \\
\\ V=\frac{140 \ g}{0.7 \ \frac{g}{cm^3}}=200 \ cm^3$

Liquid B:
$\rho=1.6 \ \frac{g}{cm^3} \\
m=128 \ g \\
\\ V=\frac{128 \ g}{1.6 \ \frac{g}{cm^3}}=80 \ cm^3$

Liquid C:
$m=140 \ g + 128 \ g=268 \ g \\
V=200 \ cm^3 + 80 \ cm^3=280 \ cm^3 \\ \\
\rho=\frac{268 \ g}{280 \ cm^3} \approx 0.96 \ \frac{g}{cm^3}$

The density of liquid C is approximately 0.96 g/cm³.

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3 years ago

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Need help with 15... thx

Rzqust [24]

8 x 1.25 = 10
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2 years ago

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If f(x)=3/4 and g(x)=3x which statement is true trust me I've tried

Evgesh-ka [11]

The answer is D.

f(x) = 3/x
g(x) = 3x

(g * f)(-9) = 3(3/-9)
(g * f)(-9) = 3(-1/3)
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