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3 years ago

Help! I’ll reward brainest its pretty easy

Mathematics

1 answer:

DochEvi [55]3 years ago

8 0

Answer:

$\frac{3}{10}$ are wearing blue shirts

Step-by-step explanation:

purple = $\frac{2}{5}$ = $\frac{4}{10}$

gold = $\frac{3}{10}$

$\frac{4}{10}$ + $\frac{3}{10}$ = $\frac{7}{10}$

1 - $\frac{7}{10}$ = $\frac{3}{10}$

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I would really appreciate help with the following, along with work shown so I can understand how these were solved.

Alja [10]

First, you have to know the double angle formula:

sin 2A = 2 sin A cos A

cos 2A = cos² A − sin² A = 2 cos² A − 1 = 1 − 2 sin² A

tan 2A = 2 tan A / (1 − tan² A)

Next, find the other leg: 17^2-15^=64, √64 is 8, so the unknown leg length is 8.

sinα=15/17, cosα=8/17, tanα=15/8

sinβ=8/17, cosβ15/17, tanβ=8/15

Plug these values in the above formula, you'll have your answers.

For the half angles, know the half-angle formula:

sin(B/2) = ± √(1 − cos B)/2

cos(B/2) = ± √(1 + cos B)/2

tan(B/2) = (1 − cos B) / sin B = sin B / (1 + cos B)

refer to this website for details:

https://brownmath.com/twt/double.htm

For the power reduction formula, please search for it. I tried to copy and paste here, but it wouldn't paste.

for number 4, factor the quadratic equation into (cscx-8)(cscx+1)=0

cscx=8 or cscx=-1

You may not have the csc button on your calculator. Recall that csc is 1/sin, so sinx=1/8 or sinx=-1, so x is either 7.18 or 270 degrees

6 0

3 years ago

Julie and her brother go to Atlanta to ride the Sky View Ferris wheel. It measures 200 feet in diameter. I want to know the dist

Zinaida [17]

Answer:

a) Circumference of Ferris wheel.

b) $\text{Circumference} = \pi d$

c) 628 feet

Step-by-step explanation:

We are given the following in question:

Diameter of Ferris Wheel = 200 feet

a) Distance around Ferris wheel

The distance around Ferris wheel is given by the circumference of Ferris wheel.

b) Formula to calculate circumference

$\text{Circumference} = \pi d$

where d is the diameter of he wheel.

c) Distance traveled in one rotation

This will be given by the circumference of the Ferris wheel.

$\text{Distance} = \pi d = 3.14\times 200 = 628\text{ feet}$

Thus, the distance traveled in one rotation is 628 feet.

8 0

3 years ago

A weather station on the top of a mountain reports that the temperature is currently 0°C and has been falling at a constant rate

MA_775_DIABLO [31]

Answer:

1 hour ago would be 3C.

3 hours ago would be 9C.

4.5 hours ago would be 13.5

Step-by-step explanation:

5 0

3 years ago

Simplify 6 over square root 8?

Serhud [2]

6/sqrt(8)= 2.121320344

8 0

4 years ago

Read 2 more answers

Mr. Hong brought his 7 year-old daughter, Jin and his 10 year-old son, Cai, to Redwood Amusement Park. An Admission ticket coste

kompoz [17]

$20.25 because 8.50 and 8.50 equal 17 and then subtract 2.00 makes 15, and then add 5.25 and you end up with 20.25

4 0

3 years ago