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4 years ago

Help me for branliest

Mathematics

1 answer:

KiRa [710]4 years ago

8 0

8.1 and 11.4, okay!

8.1 x 11.4 = 92.34

This means that there are two triangles we just measured, so its still 92.34. There are five sides including the one we just used. This means that the total area should be 461.7!

(MODERATORS, I ACCIDENTALLY PASTED SOMETHING THAT ISN'T IN HERE ANYMORE, DO NOT DELETE THIS PLEASE.)

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A bus covers 270 km distance in 6hrs i) Find the speed of the bus in the km/per hr ii) how many kilometer does it travel in 9hrs

ale4655 [162]

Answer:

Distance=Speed×Time

When speed is 40 kmph

Distance traveled by car =40×9

=360 km

When speed is 60 kmph

Time taken to complete the journey =

360

=6 hours

5 0

3 years ago

Read 2 more answers

Solve 2sin2(x) – 5sin(x) – 3 = 0. Let u = sin(x). Which of the following is equivalent to the given equation?

Orlov [11]

Answer:

$x=(-1)^{k+1}\cdot \dfrac{\pi}{6}+\pi k,\ k\in Z$

Step-by-step explanation:

Consider the equation

$2\sin^2x-5\sin x-3=0$

Substitute

$u=\sin x$

into the equation:

$2u^2-5u-3=0$

This is quadratic equation, where

$D=(-5)^2-4\cdot 2\cdot (-3)=25+24=49\\ \\\sqrt{D}=7$

Hence,

$u_1=\dfrac{-(-5)-\sqrt{D}}{2\cdot 2}=\dfrac{5-7}{4}=-\dfrac{1}{2}\\ \\u_2=\dfrac{-(-5)+\sqrt{D}}{2\cdot 2}=\dfrac{5+7}{4}=3$

Now, use the substitution again:

1. When $u_1=-\dfrac{1}{2},$ then

$\sin x=-\dfrac{1}{2}\\ \\x=(-1)^k\sin^{-1}\left(-\dfrac{1}{2}\right)+\pi k,\ k\in Z\\ \\x=(-1)^k\cdot \left(-\dfrac{\pi}{6}\right)+\pi k,\ k\in Z\\ \\x=(-1)^{k+1}\cdot \dfrac{\pi}{6}+\pi k,\ k\in Z$

2. When $u_2=3,$ then

$\sin x=3$

This equation has no solutions, because the range of $\sin x$ is $[-1,1]$ and 3>1.

4 0

4 years ago

Read 2 more answers

Math's the devil but help plz

erma4kov [3.2K]

Using the apothem, a, and the perimeter, p, the area, A, of a regular polygon is

$A = \dfrac{pa}{2}$

You need to calculate the area of the octagon and subtract the area of the square.
The perimeter is 8 times the side.

$A = \dfrac{pa}{2} - s^2$

$A = \dfrac{8 \times 13 \times 15.69}{2} - 13^2$

$A = 815.88 - 169$

$A = 646.88$

7 0

3 years ago

The average (arithmetic mean) of 5 numbers is 13. if the average of 4 of these numbers is 10, what is the fifth number?

choli [55]

The fifth number is 25

5 0

3 years ago

PLEASE HELP ME

Nonamiya [84]

Answer:

Hi, I just wanted to say that I got this question a few days ago on my test!

I haven't gotten my grade yet and I dont know if I got it right but I hope you figure it out! Best of luck to you!