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3 years ago

Help me for a brianly

Mathematics

2 answers:

KonstantinChe [14]3 years ago

8 0

The answer is 22.6 which is A

mars1129 [50]3 years ago

8 0

the answer is 11.3

because the circumstance formula of circle is ,

$\pi \: d$

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Let t = cosA + sinA find values of t if 2 - sin2A = 2(cosA + sinA)

Zinaida [17]

$2 - \sin(2A) = 2(\cos A + \sin A)\\\\2-2\sin A\cos A=2\cos A+2\sin A\\\\2\sin A\cos A+2\cos A+2\sin A-2=0\\\\1+2\sin A\cos A+2\cos A+2\sin A-3=0\\\\\sin^2 A+\cos^2 A+2\sin A\cos A+2\cos A+2\sin A-3=0\\\\(\sin A+\cos A)^2+2\cos A+2\sin A-3=0\\\\(\sin A+\cos A)^2+2(\cos A+\sin A)-3=0\\\\\\t^2+2t-3=0\\\\t^2+2t+1-4=0\\\\(t+1)^2=4\\\\t+1=2\qquad\vee \qquad t+1=-2\\\\\\\boxed{t=1\qquad\vee\qquad t=-3}$

When $A\in\mathbb{R}$

$t=\cos A+\sin A\in[-\sqrt{2};\sqrt{2}]\approx[-1.4142;1.4142]$

and there is only one answer t = 1.

For $A\in\mathbb{C}$ both values are correct.

4 0

4 years ago

What operation would you use to convert cups to gallons

denis23 [38]

One cups is equal to 0.0625 gallons so what ever your cups are just multiply it by the gallons and you will get your gallons...

3 0

3 years ago

Read 2 more answers

If m 2X = 34º and m ZZ = 26, what is mZY? OmZY = 26 OmZY = 34 mZY = 60°

Gre4nikov [31]

Answer:

The measure of the angle Y in given triangle is 120 º.

Step-by-step explanation:

Here, in ΔXYZ

∠X = 34 º , ∠Z = 26 º

By, ANGLE SUM PROPERTY of a Triangle:

Sum of all the interior angles in any given triangle is always 180 º.

⇒ ∠X+ ∠Y + ∠Z = 180 º

or, 34 º + ∠Y + 26 º = 180 º

or, ∠Y = 180 º - 60 º

⇒ ∠Y = 120 º

Hence, the measure of the angle Y in given triangle is 120 º.

7 0

4 years ago

A can in the shape of a right circular cylinder is required to have a volume of 700 cubic centimeters. The top and bottom are ma

Marrrta [24]

Answer:

the cost function is Cost=7000 m*$ /R + 50.265 $/m² * R²

Step-by-step explanation:

then the cost function is

Cost= cost of side area+ cost of top + cost of bottom = 2*π*R*L * 5$/m² +

π*R² * 8$/m² + π*R² * 8$/m²

since the volume V is

V=π*R²*L → V/(π*R²)=L

then

Cost=2*π*R*V/(π*R²) * 5$/m² + π*R² * 8$/m² + π*R² * 8$/m²

replacing values

Cost=2*700 m³ /R * 5$/m² + π*R² * 16$/m² = 7000 m*$ /R + 50.265 $/m² * R²

thus the cost function is

Cost=7000 m*$ /R + 50.265 $/m² * R²

4 0

3 years ago

Read 2 more answers

Lauren dove into a swimming pool from a 15 foot high diving board with an initial upward velocity of 8 feet per second find the

slamgirl [31]

It will take Lauren 1.25 seconds to hit the water.

With the given information, we can write the following quadratic equation.

$h=-16t^2+8tt+15$

Now, just use the quadratic formula to solve the equation.

You will get 1.25 and -0.75 as the zeros of the equation (where Laruen hits the water).
Only 1.25 makes sense in the context of this problem.

5 0

4 years ago