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Angelina_Jolie [31]

3 years ago

15

What number is 80% of 860?

2 answers:

Ksenya-84 [330]3 years ago

5 0

80% of 860 is 688 because
860 x 0.8 =

688

A percent is a 'part of a hundred', so this is why you write percents as decimals
<span>To write a percent as a decimal, follow these steps:
<span>-Remove the percent symbol.
<span>-Move the decimal point two places to the left, adding in zeros as needed.</span></span></span>
This will make it easier to solve.

pentagon [3]3 years ago

4 0

80% of 860 is 688
860 x 0.8 =

688

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F(x)=Tan^-1 (1)<br><br> PLEASE ANSWER! WILL GIVE BRAINLIEST

notka56 [123]

Answer:

−π

----

4

Step-by-step explanation:

Alright, archtan /

tan

−

1

(

x

)

is the inverse of tangent. Tan is

sin

cos

. Like the inverse of sin, the inverse of tan is also restricted to quadrants 1 and 4.

Knowing this we are solving for the inverse of tan -1. We are basically being asked the question what angle/radian does tan(-1) equal. Using the unit circle we can see that tan(1)= pi/4.

Since the "Odds and Evens Identity" states that tan(-x) = -tan(x). Tan(-1)= -pi/4.

Knowing that tan is negative in quadrants 2 and 4. the answer is in either of those two quadrants. BUT!!! since inverse of tan is restricted to quadrants 1 and 4 we are left with the only answer -pi/4.

5 0

2 years ago

What is the measure of Angle y in this figure?

uranmaximum [27]

$\qquad \qquad\huge \underline{\boxed{\sf Answer}}$

Here, in the given figure. Angle y° forms vertical opposite angle pair with Angle 163°, therefore they have equal values.

that means ~

$\qquad \sf \dashrightarrow \: y \degree = 163 \degree$

3 0

2 years ago

When an object is thrown upwards with a speed of 64 ft/sec, its height above the ground is given by the function h(t)=−16t2+64t

Svet_ta [14]

Answer:

The object will reach its highest point 0.5 seconds after it has been thrown.

Step-by-step explanation:

The object reaches its maximum height when velocity is equal to zero, the velocity is the derivative of function height. That is:

$v(t) = \frac{d}{dt}h(t)$ (1)

Where $v(t)$ is the velocity of the object at time $t$ , in feet per seconds.

If we know that $h(t) =-16\cdot t^{2}+64\cdot t$ and $v(t) = 0\,\frac{ft}{s}$ , then the time when object reaches its highest point is:

$v(t) = -32\cdot t+64$

$-32\cdot t + 64 = 0$

$t = 0.5\,s$

The object will reach its highest point 0.5 seconds after it has been thrown.

3 0

2 years ago

If a triangle has sides of 8,11, and 13. Is it a right triangle?

Vera_Pavlovna [14]

If a² + b² = c², then the triangle is <u>right</u>.

So we have (8)² + (11)² <u>?</u> (13)²

(8)² is 64, (11)² is 121, and (13)² is 169.

So we have 64 + 121 <u>?</u> 169

64 + 121 is 185 and we can see that 185 > 169.

This triangle would not be a right triangle.

In fact, it would be an acute triangle.

So no, it's not a right triangle.

8 0

3 years ago

The formula for finding the area of a circle is A=pi r 2.Solve the formula for r

olga55 [171]

Answer:

See Explanation

Step-by-step explanation:

$A = \pi {r}^{2} \\ \\ \frac{A}{\pi} = {r}^{2} \\ \\ \huge \red{ \boxed{ r = \sqrt{\frac{A}{\pi} } }}$

3 0

3 years ago