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3 years ago

HELP PLEASE :))))))))))))))

Mathematics

1 answer:

Mrac [35]3 years ago

5 0

Answer:

Step-by-step explanation:

Given,

y = rx

Hence,

=> rx = y

$= > r = \frac{y}{x}$

[By putting the value of x and y]

$= > r = \frac{1.4}{14}$

=> r = 0.1

Hence,

The constant variation r is 0.1 (Ans)

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Cos(-170°) = _____ -cos10° cos10° cos(-10°)

ikadub [295]

The right answer for:

cos(-170°) = _____

is:

-cos10°

<h2>Explanation:</h2>

The cosine function is an even function, which means that for every point $(x,y)$ on the graph of $y=cos(x)$ then the point $(-x,y)$ also lies on the graph of the function. In other words, we can write:

$cos(-170^{\circ})=cos(170^{\circ})$

But:

$170^{\circ}=180^{\circ}-10^{\circ}$

So:

$cos(170^{\circ})=cos(180^{\circ}-10^{\circ})$

By property:

$cos(a-b)=cosacosb+sinasinb \\ \\ a=180^{\circ} \\ \\ b=10^{\circ} \\ \\ cos(170^{\circ} )=cos(180^{\circ} -10^{\circ})=cos180^{\circ} cos10^{\circ} +sin180^{\circ} sin10^{\circ} \\ \\ cos(170^{\circ})=-cos(10^{\circ})+0 \\ \\ \boxed{cos(170^{\circ})=-cos(10^{\circ})}$

<h2>Learn more:</h2>

Trigonometric functions: brainly.com/question/2680050

#LearnWithBrainly

4 0

3 years ago

8 is to 64 as 2 is to x

Irina-Kira [14]

8*8=64 well 2*2=4 hope it helps

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3 years ago

Robert threw a rock off a bridge into the river. The distance from the rock to the river is modeled by the equation h=-16ť – 16t

cluponka [151]

Answer:

1.5 seconds

Step-by-step explanation:

h=-16t² – 16t+ 60

When the rock enter the water, the height is 0. ... h=0

0 = -16t² – 16t+ 60 = -4 * (4t² - 4t +15) = -4* (2t - 3) (2t +5)

2t-3=0 or 2t+5 = 0

t = 3/2 or t = -5/2 (time can't be negative)

t = 3/2 or 1.5

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3 years ago

Help! Will mark the brainiest !!

Morgarella [4.7K]

Answer:

31.98% rounded to the nearest tenth is 32 percent. The 8 rounds up and 9 goes to zero.

Step-by-step explanation:

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3 years ago

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The graph of f(x) =sqrt of x is reflected across the x-axis and then across the y-axis to create the graph of function g(x). Whi

pickupchik [31]

The original function is

f(x)=√x

As this is condition for √x function, x≥ 0

So,

Domain= [0, infinity)

Range= [0, infinity)

After the reflection across x-axis and y-axis, we get a function,

g(x)=-√-x

-x≥ 0 means x≤ 0,

So,

Domain= (-infinity, 0]

Range= (-infinity, 0]

From this you can see that

-The only value that is in the domains of both functions is 0.

-The range of g(x) is all values less than or equal to 0.

only these points are correct and all other points are wrong.

See the attached graphs for both functions.

7 0

3 years ago

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