All categories

2 years ago

Need help on 11, 12, and 13

Mathematics

1 answer:

Sati [7]2 years ago

7 0

11. is 25°
(Both triangles have two congruent angles which means the 3rd angle is bound to be the same. Just add the 90° and the 65° to get 155 and subtract from 180° because all triangles equal 180°)
12. is 25°
(Same as before, two of the angles are congruent so the third one is the same. Add all of the angles together and have them equal 180° because their is a variable present. 2x+60+70=180 or 2x+130=180. subtract 130 from both sides to get the equation 2x=50 and then divide both sides by 2 to get x=25.)
13. y=14 and x=11.6 (assuming m<d says 15x ÷ 2 because I couldn't really read it)
(m<a = m<d and m<b = m<e because they are lined up together in the ABC and DEF equation. so 3y=42 and (15x÷2=87)

You might be interested in

-6y^2 + 9y^2 - y - 9 - 7y^2 + 1 + 10y + 3y

taurus [48]

Answer: -4y^(2)+12y-8

Step-by-step explanation: Combine like terms

6 0

3 years ago

Read 2 more answers

BRAINLIEST ANSWER GETS 55 POINTS.

REY [17]

Answer:

What are the directions?

4 0

3 years ago

Read 2 more answers

HELP, answer both questions please !!! I will mark as brainlest!!!

yawa3891 [41]

Answer:

D and B

Step-by-step explanation:

the angles subtract and the other starts and loops

8 0

2 years ago

Read 2 more answers

In its Fuel Economy Guide for 2016 model vehicles, the Environmental Protection Agency gives data on 1170 vehicles. There are a

oee [108]

Answer:

15.39%

Step-by-step explanation:

Step 1

Find the z-value associated to the given datum x, in this case x = 28 mpg

<em>z is given by the formula </em>

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

where $\mu$ is the mean of the distribution and $\sigma$ is the standard deviation. In this case,

$z=\frac{x-\mu }{\sigma }=\frac{28-23}{4.9}=1.02$

Step 2

Locate the z-value in the table of z-values of the normal distribution.

(See table attached) and read the number corresponding to this z-value. In this case is highlighted in the table and its value is 0.34614.

<em>This numbers gives us the % of vehicles with a mpg between 0 and 28. </em>

Step 3

As we know that the total area under the curve for z > 0 is 0.5, then we have to subtract 0.34614 from 0.5 to obtain the % of cars with a mpg greater than 28 mpg.

0.5 - 0.34614 = 0.15386

so, the % of 2016 vehicles that have better gas mileage than the Beetle's gas mileage is 15.39 % (rounded to two decimals)

8 0

3 years ago

HELP!

jenyasd209 [6]

Well, 7% of 450 is 31.5. The error can go either way (too much or too little) so 450 - 31.5 = 418.5. We also do 450 + 31.5 = 481.5. The statement would be

Book mass = >418.5 and <481.5.

(This could be wrong, I haven't done this much before.)

7 0

2 years ago