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Zinaida [17]
3 years ago
8

Please help

Mathematics
1 answer:
Ipatiy [6.2K]3 years ago
4 0

Answer:

cos (theta) = √21/5

Step-by-step explanation:

sin (theta) = 2/5

(sin (theta))^2 = 4/25

4/25 + (cos (theta))^2 = 1

(cos (theta))^2 = 1 - 4/25 = 21/25

cos (theta) = √21/5

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What's the answer?????????????
Taya2010 [7]

Answer:

BD = 12 :)

Step-by-step explanation:

Alright, we'll need the Pythagorean theorem for this!

So, the length of AC is 10. That means the lengths of AD and DC are both half of that, which is 5 :)

DC = 5

We already know that BC = 13, so we can plug in these values into the pythagorean theorem for the right triangle BDC:

BD^2 + DC^2 = BC^2

BD^2 + 5^2 = 13^2

BD^2 + 25 = 169

BD^2 = 169 - 25 = 144

BD = √144 = 12 :)

3 0
3 years ago
Write 80% as a decimal.<br> I<br> help me??
Ghella [55]

Answer:

0.8

Step-by-step explanation:

6 0
2 years ago
Multiply and write the solution in scientific notation: 3.2 x 10^2 x 10^5
vlabodo [156]

Answer:

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5 0
3 years ago
Josh buys cucumbers that cost $0.62 per pound.He pays $2.79 for the cucumbers.
Sphinxa [80]
Please refer to the other post you saw.

Josh's estimate IS reasonable because when you have a number 5 or above after the decimal, you round up. Although it's reasonable to round up to 5 pounds, the actual amount is 4.5 pounds, or four and a half.
5 0
3 years ago
What is the domain of the function on the graph?
Dennis_Churaev [7]

Answer:

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