4 years ago

What is 5+4? Please help I would like to know?

Mathematics

2 answers:

dolphi86 [110]4 years ago

8 0

Answer:

Step-by-step explanation:

you can always use your fingers or make circcles to count

Free_Kalibri [48]4 years ago

8 0

Answer:9

Step-by-step explanation: how many fingers do you have? 10 Right? so you could cont five on one hand and four on the other to get nine.

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Which of the following is equivalent to the complex number -8(7i - 3i^2)

Leni [432]

Answer: B) -56i - 24

This is the same as -24 - 56i

=============================================

Explanation:

The 'i' refers to the imaginary number $\sqrt{-1}$

In other words, $i = \sqrt{-1}$

Squaring both sides gets us $i^2 = -1$

So,

$x = -8(7i - 3i^2)\\\\x = -8(7i - 3(-1))\\\\x = -8(7i + 3)\\\\x = -8(7i) -8(3)\\\\x = -56i -24 \ \ \text{ .... Answer: Choice B}\\\\x = -24 - 56i\\\\$

The result is in the form a+bi where a = -24 is the real part and b = -56 is the imaginary part.

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3 years ago

What is the length of the hypotenuse? If necessary, round to the nearest tenth.

azamat

By the Pythagorean theorem,

$a^{2}+12^{2}=13^{2}\\\\a^{2}+144=169\\\\a^{2}=25\\ \\ a=\boxed{5}$

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There was 18 pounds of chocolate in each case

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Step-by-step explanation:

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Step-by-step explanation:

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