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nekit [7.7K]
3 years ago
13

What is 8^-2 give you the brainlest

Mathematics
2 answers:
Fantom [35]3 years ago
4 0
8^-2=0.015625

:) hope this helps
Tpy6a [65]3 years ago
3 0
.015625
I hope you have a great day
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Solve for x <br><br><br><br><br> qwertyuiopasdfghjklzcvbnm
Ludmilka [50]

The triangles ABD, ADC and ABC are similar (AA stands for "angle, angle" and means that the triangles have two of their angles equal).


If two triangles have two of their angles equal, the triangles are similar.


Therefore the sides of triangles are in proportion.


\dfrac{c}{6}=\dfrac{2}{c}


cross multiply


c\cdot c=6\cdot2\\\\c^2=12\to c=\sqrt{12}


Use the Pythagorean theorem for calculate x:


x^2=2^2+(\sqrt{12})^2\\\\x^2=4+12\\\\x^2=16\to x=\sqrt{16}\to\boxed{x=4}

8 0
3 years ago
Life tests on a helicopter rotor bearing give a population mean value of 2500 hours and a population standard deviation of 135 h
stira [4]

Answer:

The percent of the parts are expected to fail before the 2100 hours is 0.15.

Step-by-step explanation:

Given :Life tests on a helicopter rotor bearing give a population mean value of 2500 hours and a population standard deviation of 135 hours.

To Find : If the specification requires that the bearing lasts at least 2100 hours, what percent of the parts are expected to fail before the 2100 hours?.

Solution:

We will use z score formula

z=\frac{x-\mu}{\sigma}

Mean value = \mu = 2500

Standard deviation = \sigma = 135

We are supposed to find  If the specification requires that the bearing lasts at least 2100 hours, what percent of the parts are expected to fail before the 2100 hours?

So we are supposed to find P(z<2100)

so, x = 2100

Substitute the values in the formula

z=\frac{2100-2500}{135}

z=−2.96

Now to find P(z<2100) we will use z table

At z = −2.96 the value is 0.0015

So, In percent = .0015 \times 100=0.15\%

Hence The percent of the parts are expected to fail before the 2100 hours is 0.15.

5 0
3 years ago
What binomial do you have to add to the polynomial 2x^2+3y^2-5xy+1 to get the following. A polynomial that does not contain x
kiruha [24]

The Binomial -2x^{2} + 5xy have to be add to the polynomial 2x^{2} +3y^{2} -5xy+1 to get polynomial that does not contain x.

<h3>What is binomial?</h3>

A mathematical expression consisting of two terms connected by a plus sign or minus sign.

Example: x + 2 is a binomial, where x and 2 are two separate terms.

<h3>What is polynomial?</h3>

A polynomial is an expression consisting of indeterminates and coefficients, that involves only the operations of addition, subtraction, multiplication, and non-negative integer

According to question

polynomial 2x^{2} +3y^{2} -5xy+1

When added to binomial -2x^{2} + 5xy

= 3y^{2} +1  (as 2x^{2}  -5xy got cancelled )

and this polynomial does not contain x

Hence, Binomial -2x^{2} + 5xy have to be add to polynomial 2x^{2} +3y^{2} -5xy+1 to get polynomial that does not contain x.

To know more about Binomial and polynomial  here :

brainly.com/question/1698358?\

# SPJ2

4 0
2 years ago
Greg thinks of a number, multiplies it by 3, subtracts 5 and then multiplies by 2. His answer is 26. What number did Greg think
soldi70 [24.7K]

Answer:

x

3x

3x-5

2(3x-5)

so

2(3x-5)=26

3x-5=13

3x=18

x=6

he thought of 6

8 0
2 years ago
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5 0
3 years ago
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