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sesenic [268]
3 years ago
5

Pl help it’s for a grade

Mathematics
2 answers:
Nonamiya [84]3 years ago
6 0
The answer is B hqriethrwjwrhqrg
True [87]3 years ago
5 0
I think the answer is b
I hope this helps :)
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Solve in radians help plz
PIT_PIT [208]
I think we can use the identity  sin x/2  = sqrt [(1 - cos x) /2]

cos x -  sqrt3 sqrt ( 1 - cos x) /sqrt2 = 1

cos x - sqrt(3/2) sqrt(1 - cos x) = 1
sqrt(3/2)(sqrt(1 - cos x) =  cos x - 1   Squaring both sides:-
1.5 ( 1 - cos x) = cos^2 x - 2 cos x + 1

cos^2 x - 0.5 cos x - 0.5 = 0 

cos x = 1 , -0.5

giving x = 0 , 2pi, 2pi/3,  4pi/3  ( for  0  =< x <= 2pi)

because of thw square roots some of these solutions may be extraneous so we should plug these into the original equations to see if they fit.

The last 2 results dont fit so the answer is  x = 0 , 2pi Answer
5 0
3 years ago
Suppose y varies directly as x and y=21 when x=7. which is an equation relating x and y
astra-53 [7]
Y varies directly as x: y=kx, k is a constant.
when x=7, y=21, so we know k=3
therefore, the equation is y=3x
8 0
3 years ago
If you wish to calculate the interest on an investment with a rate of 3.58%, what number will you plug into your equation?
irina [24]
To get a certain percentage as a decimal, all you have to do is divide this percentage by 100.

Applying this on the given question, we will find that:
3.58% = (3.58) / (100) = 0.0358

Comparing the calculated value to the given choices, we will find that the correct choice is:
<span>c) 0.0358</span>
6 0
3 years ago
Read 2 more answers
What is the value of the expression 3/8 ÷ 1 1/2
Shtirlitz [24]

Answer:

0.25

Step-by-step explanation:

i used a caculator (sorry im terrible at spelling)

8 0
3 years ago
A hang glider pilot accidentally drops her compass from the top of a 400-foot cliff. The height h of the compass after t seconds
KonstantinChe [14]

Answer:

5 seconds

Step-by-step explanation:

H= -16t2 + 400

Hit ground

H=0

0 = -16t2 + 400

0 = -16 ( t2 - 25)

-16

t2 -25 = 0

(t + 5)(t - 5) = 0

t + 5 = 0

- 5 -5

t = -5

t - 5 = 0

+ 5 +5

t = -5

t = 5

5 seconds to hit the ground

7 0
3 years ago
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