3 years ago

GUYS PLEASE HELP ME PLEASE HELP PLEASE PLEASE!!!!

Mathematics

1 answer:

snow_tiger [21]3 years ago

3 0

Answer:

18 , 18.901036

Step-by-step explanation:

3.052 * 6.193

estimate : 3 * 6 = 18

actual answer : 3.052 * 6.193 = 18.901036

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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):

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

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3 years ago

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What is the x-intercept for 12x+2=17y

ollegr [7]

12x+2=17y
12x+2=17(0)
12x+2=0
-2 -2
——
12x+0= -2
— —
12 12
x= -2/12
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3 years ago

(07.06 MC) What is the solution to the equation 1.2m − 0.8 = −2.0m? m = 0.25 m = 0.4 m = 1 m = 4

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Answer:

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Step-by-step explanation:

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