3 years ago

Please help and if you dont know please don't answer

Mathematics

2 answers:

quester [9]3 years ago

8 0

The answer is 81 centimeters

Allisa [31]3 years ago

5 0

Answer:

81cm

Step-by-step explanation:

15cm + 20cm + 21cm + 25cm = 81cm

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Problem Solving<br> Find the exact solution of each equation for 0 < theta < 2 pi

horrorfan [7]

Answer:

C) $\theta=\frac{\pi}{4},\frac{3\pi}{4},\frac{5\pi}{4},\frac{7\pi}{4}$

Step-by-step explanation:

$sin^2\theta=\frac{1}{2},\: 0\leq\theta\leq2\pi\\ \\\frac{1-cos(2\theta)}{2}=\frac{1}{2}\\ \\1-cos(2\theta)=1\\\\cos(2\theta)=0\\\\2\theta=\frac{\pi}{2}+\pi n\\ \\\theta=\frac{\pi}{4}+\frac{\pi}{2}n\\ \\ \theta=\frac{\pi}{4},\frac{3\pi}{4},\frac{5\pi}{4},\frac{7\pi}{4}$

Recall the identity $sin^2\theta=\frac{1-cos(2\theta)}{2}$

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2 years ago

Benny bought 9 new basketball trading cards to add to his collection. The next day his dog ate half of his collection. There are

frozen [14]

Answer: Benny started with 77 cards.

Step-by-step explanation:

The first step is to find what 43 is a half of. If we multiple 43 by two, we see that the answer is 86. As this number included the 9 cards he bought the day before, we must subtract 9 from 86, giving us 77.

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3 years ago

I need help with this math, it is hard and I’m not good at it. I don’t understand this math so plz help me.

klasskru [66]

142 hope I’m right this time

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3 years ago

Read 2 more answers

What is 70% of 66 ? plz help me

Dmitry_Shevchenko [17]

46.2
you do 70/100=x/66
then cross multiply so (70•66)=100x
then you get 4620=100x
then you divide both sides by 100 and get x=46.2

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