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amm1812
2 years ago
8

Pls help I really need it ASAP

Mathematics
2 answers:
gtnhenbr [62]2 years ago
8 0

Answer:

0, -1 for part A -1,-9 for part B

Step-by-step explanation:

gogolik [260]2 years ago
3 0
I would help but i’m not rlly a written response type of guy. hang in the tight the kid. someone will help soon
You might be interested in
Question is 15 points
mihalych1998 [28]

This is a doozy so pay attention. First thing you have to recognize is that is a trig identity, the sum identity for cosine to be exact. That formula is

cos(\alpha +\beta )=cos\alpha cos\beta -sin\alpha sin\beta.

So that means you need to find the cosine of alpha and the sin of beta. We are given the sin of alpha being 4/5 in the first quadrant. If you set up the sin ratio which is side opposite over hypotenuse of a right triangle, you put the 4 on the side opposite the reference angle, alpha, and the hypotenuse of 5 on the terminal ray and then you have to find the missing side of the right triangle you created. Using Pythagorean's theorem, you find that the missing side, which is the adjacent side to alpha, is 3. Now you can find the cosine of alpha as well, since cosine is the side adjacent, 3, over the hypotenuse, 5. So far wwe have

sin\alpha =\frac{4}{5} and

cos\alpha =\frac{3}{5} for that first angle. Now moving on to the second angle. The cosine of beta is side adjacent, 5, over the hypotenuse, 13, and we are missing the side opposite the reference angle beta. Using Pythagorean's theorem again to find the side opposite, we have that that side measures 12. Now we can find the sine of beta using that opposite side, 12, over the hypotenuse, 13. What we have now is

cos\beta =\frac{5}{13} and

sin\beta =\frac{12}{13}. According to the identity, we have to multiply those ratios now:

(\frac{3}{5}*\frac{5}{13})-(\frac{4}{5}*\frac{12}{13}).

When you do that you get

\frac{3}{13}-\frac{48}{65}.

Of course in order to subtract those 2 fractions you need a common denominator which is 65 so

\frac{15}{65}-\frac{48}{65} which gives you a final answer of -\frac{33}{65} which is the first choice given above. There you go!

4 0
2 years ago
How
dem82 [27]

Answer:

it is 1.31148125 m2

Step-by-step explanation:

6 0
2 years ago
PLEASSSSSE HELPPPPPP<br> This is my third post of this! I really need help
Nesterboy [21]
Answer: x=25

solution:

we know that
The triangle external angle theorem states that: An exterior angle of a triangle is equal to the sum of the opposite interior angles

In this problem:
m∠9=m∠7+m∠8

substitute the given values:
(6x-20)°=30°+4x°

now solve for x:
6x-4x=30+20
2x=50
x=25 which is the final answer:)
6 0
3 years ago
Will give brainliest
Tju [1.3M]

Answer:

The answer would have to be B

7 0
2 years ago
HELP I WILL MARK BRAINLIEST!!!
MrMuchimi

Answer:

17.7 as the actual gas mileage recorded is 12 mpg.

Step-by-step explanation:

8 0
2 years ago
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