3 years ago

Simplify this expression. 3x2(7x2 − 9)

Mathematics

1 answer:

kirill115 [55]3 years ago

4 0

<span>3x2(7x2 − 9)
Multiply 3x^2 by 7x^2 and -9(Use distributive property)
Final Answer: D.) 21x^4 - 27x^2</span>

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How much greater, in square inches, is the area of a circle of radius 20 inches than a circle of diameter 20 inches? Express you

r-ruslan [8.4K]

Answer:

300π in²

Step-by-step explanation:

The circle with diameter 20 inches has a radius of 10 inches, so an area of ...

A = πr² = π(10 in)² = 100π in²

The circle with a radius of 20 inches has an area of ...

A = πr² = π(20 in)² = 400π in²

The larger circle is larger by ...

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4 years ago

Simplify -7(-5 + 8x) +11x

sweet-ann [11.9K]

Answer:

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Step-by-step explanation:

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4 years ago

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lara [203]

Answer:B

Step-by-step explanation:

Given

Height of building $h=30\ m$

Angle of depression $\theta =45^{\circ}$

Suppose distance of Point A from base of building be $x$

From diagram we can write

$\Rightarrow \tan \theta =\dfrac{h}{x}$

$\Rightarrow \tan (45^{\circ})=\dfrac{30}{x}$

$\Rightarrow 1=\dfrac{30}{x}$

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So, point A is $30\ m$ from base of building

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3 years ago

4/17 + 3/10 + 9/20 + 3/11 + 7/15

asambeis [7]

Answer:

$\frac{19351}{11220}$

Step-by-step explanation:

$\frac{2640+3366+5049+3060+5236}{11220} = \frac{19251}{11220}$

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4 years ago

X/8.5=16/4<br> what's the answer

elixir [45]

Answer: x = 34

Explanation:

x/8.5 = 16/4
x/8.5 = 4
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x = 34

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3 years ago