2 years ago

I need help on all the questions here

Mathematics

2 answers:

Slav-nsk [51]2 years ago

4 0

They all are all math vocabulary

GuDViN [60]2 years ago

4 0

Yeah they are math vocab. Maybe you have choices or past pages telling you the answers?<span />

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Find the value of y picture *****

77julia77 [94]

I think its 54 too soo

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2 years ago

If cos x=8/17, and 270° < x < 360°<br> what is cos(2x)?

svp [43]

Answer: $\bold{-\dfrac{161}{289}}$

<u>Step-by-step explanation:</u>

Given: cos x = $\dfrac{8}{17}$ , x is in Quadrant 4

Use Pythagorean Theorem to find sin x:

8² + y² = 17²

y² = 17² - 8²

y² = 289 - 64

y² = 225

y = 15

→ sin x = $-\dfrac{15}{17}$

Use the double angle formula to find cos (2x):

$cos (2x) = cos^2 x - sin^2 x\\\\.\qquad=\bigg(\dfrac{8}{17}\bigg)^2-\bigg(-\dfrac{15}{17}\bigg)^2\\\\\\.\qquad=\dfrac{64}{289}-\dfrac{225}{289}\\\\\\.\qquad=-\dfrac{161}{289}$

8 0

3 years ago

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During a game, Dennis lost 50 points in the first round and then lost 75 more points in the second round. Write an addition expr

zysi [14]

Answer:

-125

Step-by-step explanation:

add 50 and 75 =125 make in negative

5 0

2 years ago

If i only do 8/9 assignments what will my grade be if it was 100%

Pie

Answer:

Im not sure that really makes sense but I think your grade would be 90% if you did 8/9 or somewhere around that

Step-by-step explanation:

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2 years ago

Read 2 more answers

Pls help I’ll brainlest ASAP

Volgvan

Answer:

Step-by-step explanation:

5 0

1 year ago