Did two of them for you as reference for the rest.
Explanation for #1
The sum of all the angles in a triangle is 180. Simply add the given angles. Take 180 and subtract the sum of the given angles
180 - (58 + 47) = 75
Missing angle is 75
Explanation for #4
A straight angle is 180 degrees. Same thing as the first: add the given angles then take 180 and subtract it.
Then take 180 <em>again </em>and subtract the answer you got from the first step.
180 - (21 + 34) = 125
180 - 125 = 55
The missing angle is 55
1/5 + 1/3·x > 1/2·x - 1/4
1/3·x - 1/2·x > - 1/4 - 1/5
2/6·x - 3/6·x > - 5/20 - 4/20
- 1/6·x > - 9/20
1/6·x < 9/20
x < 54/20
x < 27/10
x < 2.7
Answer: 7.36
Step-by-step explanation:
avg = (6.72 + 8.40 + 8.40)/3 = 23.52/3 = 7.36
3x-3x=7 x=7 or 0 cause anything ×0 is 0
What I would do is round. So, 60 and 1/16 would most likely be rounded to 60, and 3 1/8 would most likely be rounded to 3.
If you want to know how much he grew, then you would add.
So Im guessing that your answer is D) 60 + 3
Hope this helped :)