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3 years ago

If sina4/5 find cosa

Mathematics

1 answer:

DerKrebs [107]3 years ago

4 0

Answer:

cosa = 3/5

Step-by-step explanation:

Use Trignometrical identity cosa = √ 1 − sin ^2a

cos a = √ 1 − 16 /25 = √ 9 /25 = 3 /5

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A certain experimental mathematics program was tried out in 2 classes in each of 32 elementary schools and involved 37 teachers.

zheka24 [161]

Answer:

A) 0 and 13

Step-by-step explanation:

64 - 37 = 27

27/2 = 13.5

13 teachers can teach 3 classes at max

6 0

2 years ago

What expression represents the volume of the cylinder, in cubic units?

Marat540 [252]

Answer:

It's A

Step-by-step explanation:

I hope that it's a correct answer.

7 0

3 years ago

Two semicircles are attached to the sides of a rectangle as shown.

melomori [17]

Answer:

$157\ in^{2}$

Step-by-step explanation:

we know that

The area of the figure is equal to the area of rectangle plus the area of two semicircles

The area of rectangle is equal to

$A=14*5=70\ in^{2}$

The area of the small semicircle is equal to

$A=\pi r^{2} /2$

$r=5/2=2.5\ in$ -----> radius is half the diameter

substitute

$A=(3.14)(2.5^{2})/2=9.8125 in^{2}$

The area of the larger semicircle is equal to

$A=\pi r^{2} /2$

$r=14/2=7\ in$ -----> radius is half the diameter

substitute

$A=(3.14)(7^{2})/2=76.93\ in^{2}$

The area of the figure is equal to

$70+9.8125+76.93=156.7425=157\ in^{2}$

8 0

3 years ago

Read 2 more answers

Can u answer this question the problem is below

Elodia [21]

Answer:

-3

-7

-8

Step-by-step explanation:

5 0

2 years ago

2³+2²+2÷2²+2+1=2 prove that this relation is true for any natural numbers

UkoKoshka [18]

So, this question is basically asking us "If we had an x instead of a 2, would this be true?" We can try and see what we get:

$\frac{x^3+x^2+x}{x^2+x+1}=x$

So, if we want to show this we have to change the numerator or denominator in such a way that we can cancel some common factors. Notice that $x^3+x^2+x=x(x^2+x+1)$

If we replace the factored numerator with the original one, we get:

$\frac{x(x^2+x+1)}{x^2+x+1}=x \implies \\ x=x$

Since we have an equality, this relation is proved.

3 0

2 years ago

If sina4/5 find cosa​

If sina4/5 find cosa