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GalinKa [24]
3 years ago
13

I need help i don’t understand

Mathematics
1 answer:
UNO [17]3 years ago
4 0

9514 1404 393

Answer:

  x = 12.5

Step-by-step explanation:

The value of x is part of the value of an angle in a triangle where the other angles are known. This suggests that the relevant theorem is the "angle sum theorem," which tells you <em>the sum of angles in a triangle is 180°</em>.

This gives you the equation ...

  60° +60° +(4x+10°) = 180° . . . . total of all angles is 180°

  4x +130° = 180° . . . . . . . . . . collect terms

  4x = 50° . . . . . . . . . . . . subtract 130° from both sides

  x = 12.5° . . . . . . . . . divide both sides by 4

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A regular pentagon has a perimeter of 40cm what is the measure of each interior angle.
Vika [28.1K]

Answer:

8 because you have to divide 40 by 5 and it will get you to 8

8 0
3 years ago
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A student measured the lead content of a paint sample 4 times. The standard deviation of the measurements was found to be 0.76%
Lady_Fox [76]

Answer:

CI =0.894%

Step-by-step explanation:

From the question we are told that:

Sample size n=4

Standard deviation \sigma=0.76\% of \=x

Confidence level \mu =90\%=0.90

Degree of Freedom Df=n-1=3

Therefore

Test T from table is given

 t=2.353

Generally the equation for Confidence interval CI is mathematically given by

 CI =t*\frac{\sigma}{\sqrt{n}}

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6 0
3 years ago
A submarine is cruising at an elevation of
krek1111 [17]

Answer:

Step-by-step explanation:

these are two different questions .

first i solve first

position of submarine= -250/3 meters below see level

height descended=120 % of 250/3=120/100 ×(250/3)=300,00/300=100 m

new location=-250/3+(-100)=-650/3 below see level.

2nd question

position of submarine=-250 2/3=-752/3 m below see level

height descended=120 5/8=965/8 m =-965/8 m below see level

new positin=-752/3+(-965/8)=-(6016+2895)/24=-8911/24=-371 7/24m below sesa level.

6 0
3 years ago
An adult ticket for a magic show costs $18. A children's ticket for the magic show costs $12.
BlackZzzverrR [31]

Answer:

for adult tickets 90 and for children’s tickets 30

Step-by-step explanation:

because 90(18) = 1,620 and 30(12) is 360 and when you add up 1,620 + 360 you will get the total which is $1980

Also i just took the test on k12 and got it right and i hope this helps!

6 0
3 years ago
Maria is training for a triathlon. Yesterday, she rode her bike for eight and two-thirds miles in two-thirds of an hour. If Mari
sesenic [268]
(8 2/3) / (2/3) = x / 1....8 2/3 miles to 2/3 hr = x miles to 1 hr
cross multiply
(2/3)(x) = (8 2/3)(1)
2/3x = 26/3
x = 26/3 * 3/2
x = 26/2...which equals 13....she will ride 13 miles in 1 hr
5 0
3 years ago
Read 2 more answers
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