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3 years ago

Evaluate cos 150° without using a calculator.

Mathematics

1 answer:

Readme [11.4K]3 years ago

5 0

Answer:

Step-by-step explanation:

It would be greatly appreciated if you gave me brainlest.

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3. Is XY Tangent to circle Z? Y 12 X (20 Z 18

Ratling [72]

Answer:

XY is a tangent

Step-by-step explanation:

Given

$XY = 12$

$WY = 20$

$WZ = 8$

Required

Is XY a tangent?

XY is a tangent if:

$WY^2 = XY^2 + WX^2$

Because XY should make a right angle at point X with the circle

Where

$WX = 2 * WZ$

So, we have:

$WY^2 = XY^2 + WX^2$

$WY^2 = XY^2 + (2*WZ)^2$

$WY^2 = XY^2 + (2WZ)^2$

$WY^2 = XY^2 + 4WZ^2$

This gives:

$20^2 = 12^2 + 4*8^2$

$400 = 144 + 256$

$400 = 400$

Yes, XY is a tangent

4 0

3 years ago

Anthony Patella earns $325 a week working part-time at his uncle's restaurant. How much does he make in a

GaryK [48]

Anthony earns $16,958.5 in a year because,since there is 52.18 weeks in a year, you have to multiply 52.18 x $325 to find out how much money he made in a year.

6 0

3 years ago

Name the property of real numbers illustrated by the equation 2*(√8*7)=(2*√8)*7

umka21 [38]

Associative property of mulipication, the ability to move parenthasees with mltipication or additon

8 0

3 years ago

Read 2 more answers

How do you solve the equation -7/8k=21

loris [4]

$- \frac{7}{8} k$ = 21

First, simplify $\frac{7}{8} k$ to $\frac{7k}{8}$ / Your problem should look like: $-\frac{7k}{8}$ = 21
Second, multiply both sides by 8. / Your problem should look like: -7k = 167
Third, divide both sides by -7. / Your problem should look like: k = $\frac{168}{-7}$
Fourth, simplify $\frac{168}{-7}$ to $\frac{168}{7}$ / Your problem should look like: k = $- \frac{168}{7}$
Fifth, simplify $\frac{168}{7}$ to 24. / Your problem should look like: k = -24

Answer: k = -24

4 0

3 years ago

Need help with tree diagrams

oksian1 [2.3K]

There is a 50% chance.

Explanation:

There is always a 50-50 chance that the coin will land on either heads or tails.

6 0

3 years ago