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olganol [36]
3 years ago
14

Hi can someone please help me? If sin2A=cos 3A find the value of A. Can you please explain in full detail how you arrived at you

r answer? Also Find the exact value of (sec30)^2. Will I need to use a calculator in order to solve this prob?
Mathematics
1 answer:
cupoosta [38]3 years ago
6 0
<span>Sin (x) = Cos (90 - x)</span>
<span>sin(2A) = cos (90 - 2A)
=cos (3A)
90 - 2A = 3A
5A=90
A=18</span>
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5 0
3 years ago
Henry ran five races, each of which was a different positive integer number of
dolphi86 [110]

Answer:

10 miles.

Step-by-step explanation:

Let x be the number of miles on Henry's longest race.

We have been given that Henry ran five races, each of which was a different positive integer number of  miles.

We can set an equation for the average of races as:

\frac{\text{The sum distances of 5 races}}{5}=4

As distance covered in each race is a different positive integer, so let his first four races be 1, 2, 3, 4.

Now let us substitute the distances of 5 races as:

\frac{1+2+3+4+x}{5}=4

\frac{10+x}{5}=4

Let us multiply both sides of our equation by 5.

\frac{10+x}{5}*5=4*5

10+x=20

Let us subtract 10 from both sides of our equation.

10-10+x=20-10

x=10

Therefore, the maximum possible distance of Henry's longest race is 10 miles.

7 0
3 years ago
Kailey wrote 8,912,000 in scientific notation as 89.12 times 10 Superscript 5. Which statement best describes Kailey's work?
ioda

Answer:

Could You Please Explain More?

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
(6+9)2+6(600-9)+600 divide 30
Evgesh-ka [11]

Step-by-step explanation:

GIVEN

HERE

= 6+9+2+6+600÷30 { firstly add numbers }

= 623 ÷ 30

= 20

I think you understand

8 0
2 years ago
Read 2 more answers
Please help for instant brainliest.
Mnenie [13.5K]

x + y = 7

x - y = 35

and that is your answer

5 0
3 years ago
Read 2 more answers
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