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3 years ago

Which answer is equal to -2i*(-2i)? A) 4 B) -4 C) 4i D) -4i

Mathematics

2 answers:

Nadya [2.5K]3 years ago

6 0

I got letter B which is -4

butalik [34]3 years ago

4 0

$\bf \textit{recall that }i^2=-1\qquad therefore
\\\\\\
-2i(-2i)\implies +2^2i^2\implies 4(-1)\implies -4$

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Mrs. Beasley is asking students to find the volume of the cylinder below using 3.14 for pi. Which student wrote the correct expr

satela [25.4K]

Answer:

$A=3.14\times r^{2}$

Step-by-step explanation:

The volume of a cylinder is given as the product of surface area and height.

V=Ah

But the surface area is given by

$A=\pi r^{2}$

Taking value of $\pi$ as 3.14 then the surface area is

$A=3.14\times r^{2}$

Therefore, the volume being V=Ah hence

$V=3.14\times r^{2}\times h$

This question only wants us to establish the surface area hence

$A=3.14\times r^{2}$

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3 years ago

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Nuetrik [128]

The left figure that is 2.5 is taken as numerator while the right figure that is 3.15 is take as denominator.
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2.5/3.15
the multiply by a 100 to remove the decimals to give
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3 years ago

Find the y-intercept of the function.<br> y = 6^x

dsp73

Y-intercept of f(x) is a value of function for x = 0.

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3 years ago

Angel bought 8 oranges and 11 apples for a total of $15.22.He knows that each orange cost $0.50 and reasoned that each Apple mus

Schach [20]

Oranges = x
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8x + 11y = 15.22
x = 0.50

8(0.50) + 11y = 15.22
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pychu [463]

Answer:

14 cm

Step-by-step explanation:

There are 2 equal sides of 13 cm, thus the third side is

third side = perimeter - 13 - 13 = 50 - 26 = 14

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