Please help need quickly!

Mathematics

1 answer:

MAXImum [283]2 years ago

4 0

Pythagoras
28^2-19^2= 423
Square root of 423 = 20.5669638

Answer = 20.5669638

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A class has a total of 135 absences over 18 weeks. what is the mean number of absences per week?

Butoxors [25]

135 divided by 18 is 7.5 so I would guess 7 each week and maybe possibly 8 on some weeks

5 0

2 years ago

Out of 32 students in a class five said they rode there bikes to school. Based on these results, how many of the 800 students ri

melamori03 [73]

YOu have to set a proportion or do this easy method...

5/32= <span>0.15625
the you multiply </span><span>0.15625 by 800 because that is what you want to find out of...

that means the answer is 125

125 ride their bike to school...

hope that helps and you give good feedback

</span>

3 0

2 years ago

Can someone please help me?

zaharov [31]

Answer:

8000000000

Step-by-step explanation:

8 times 10^9 = 8000000000

4 0

10 months ago

Read 2 more answers

I don't need you to work it out, just theorem(s) i need to reach the answer :)

VikaD [51]

Not sure why such an old question is showing up on my feed...

Anyway, let $x=\tan^{-1}\dfrac43$ and $y=\sin^{-1}\dfrac35$ . Then we want to find the exact value of $\cos(x-y)$ .

Use the angle difference identity:

$\cos(x-y)=\cos x\cos y+\sin x\sin y$

and right away we find $\sin y=\dfrac35$ . By the Pythagorean theorem, we also find $\cos y=\dfrac45$ . (Actually, this could potentially be negative, but let's assume all angles are in the first quadrant for convenience.)

Meanwhile, if $\tan x=\dfrac43$ , then (by Pythagorean theorem) $\sec x=\dfrac53$ , so $\cos x=\dfrac35$ . And from this, $\sin x=\dfrac45$ .

So,

$\cos\left(\tan^{-1}\dfrac43-\sin^{-1}\dfrac35\right)=\dfrac35\cdot\dfrac45+\dfrac45\cdot\dfrac35=\dfrac{24}{25}$

7 0

3 years ago

Find the diameter of the circle with the given circumference use 3.14 C=18

algol [13]

The formula for the circumference of a circle is pi * r * 2

First we solve for r (the radius)
pi*r*2 = C
pi*r*2 = 18

Divide 18 by 2
pi*r = 9

Then divide 9 by 3.14
pi= 9/3.14 which is 2.866

The diameter is 2 times length of the radius so multiply 2.866 by 2
The diameter is about 5.732
(And you can round of course)

Hope that helped

3 0

2 years ago