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2 years ago

Can someone help me with this? Please and thank you! :)

Mathematics

2 answers:

Sindrei [870]2 years ago

8 0

Answer:

7 families

Step-by-step explanation:

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Molodets [167]2 years ago

4 0

Answer:7 familes

21 divided by 3=7

Step-by-step explanation:

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A study of teenage drivers found that 63% text while driving and 30% have a car accident in their first year of driving. 21% of

Kipish [7]

Answer:

33.33%

Step-by-step explanation:

63% of teenage drivers text while driving

21% of teenage drivers text while driving and have car accident in their first year

This means that a third of teenage drivers that text while driving get involved in a car accident during their first year, 33.33% is the probability then

6 0

3 years ago

Find the lengths of the sides of the triangle PQR. P(2, −3, −4), Q(8, 0, 2), R(11, −6, −4) |PQ| = Incorrect: Your answer is inco

Aloiza [94]

Answer:

the length PQ is 9 units,the length QR is 9 units,the length PR is 9.48 units,the triangle is not a right triangle,this is a isosceles triangle

Step-by-step explanation:

Hello, I think I can help you with this

If you know two points, the distance between then its given by:

$P1(x_{1},y_{1},z_{1} ) \\P2(x_{2},y_{2},z_{2})\\\\d=\sqrt{(x_{2}-x_{1} )^{2} +(y_{2}-y_{1} )^{2}+(z_{2}-z_{1} )^{2} }$

Step 1

use the formula to find the length PQ

Let

P1=P=P(2, −3, −4)

P2=Q=Q(8, 0, 2)

$d=\sqrt{(8-2)^{2} +(0-(-3))^{2}+(2-(-4))^{2}} \\ d=\sqrt{(6)^{2} +(3)^{2}+(6 )^{2}}} \\d=\sqrt{36+9+36}\\d=\sqrt{81} \\d=9\\$

the length PQ is 9 units

Step 2

use the formula to find the length QR

Let

P1=Q=Q(8, 0, 2)

P2=R= R(11, −6, −4)

$d=\sqrt{(11-8)^{2} +(6-0))^{2}+(-4-2 )^{2}} \\\\\\d=\sqrt{(3)^{2} +(6)^{2}+(-6 )^{2}}} \\d=\sqrt{9+36+36}\\d=\sqrt{81} \\d=9\\$

the length QR is 9 units

Step 3

use the formula to find the length PR

Let

P1=P(2, −3, −4)

P2=R= R(11, −6, −4)

$d=\sqrt{(11-2)^{2} +(-6-(-3)))^{2}+(-4-4 )^{2}} \\\\\\d=\sqrt{(9)^{2} +(-6+3)^{2}+(-4-(-4) )^{2}}} \\d=\sqrt{81+9+0}\\d=\sqrt{90} \\d=9.48\\$

the length PR is 9.48 units

Step 4

is it a right triangle?

you can check this by using:

$side^{2} +side^{2}=hypotenuse ^{2}$

Let

side 1=side 2= 9

hypotenuse = 9.48

Put the values into the equation

$9^{2} +9^{2} =9.48^{2}\\ 81+81=90\\162=90,false$

Hence, the triangle is not a right triangle

Step 5

is it an isosceles triangle?

In geometry, an isosceles triangle is a type of triangle that has two sides of equal length.

Now side PQ=QR, so this is a isosceles triangle

Have a great day

3 0

3 years ago

Simplify 10x - (5x-x)

Alex17521 [72]

Answer:

$\boxed{6x}$

Step-by-step explanation:

$10x - (5x-x)$

Distribute the Negative Sign:

$= 10x + -1 (5x - x)$

$= 10x + -1 ( 5x) + -1 (-x)$

$= 10x + -5x + x$

Combine Like Terms:

$= 10x + -5x + x$

$= (10x + -5x + x)$

$= 6x$

Hope this helped you!

3 0

3 years ago

What is 423.408 rounded to the neatest hundredth

xeze [42]

The hundredth is the second decimal place. You know the rounding rules are where you look at the previous place and if it's 5 or above the number place your rounding to goes up. So the answer is 423.41

4 0

3 years ago

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What is the volume of the cylinder below? With 6,4,7

Ivan

A! You need to multiply all the numbers together

3 0

2 years ago

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