Asap:
what is the measure of angle a in the triangle?

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30

Step-by-step explanation:

The sum of all the angles in a triangle is always, always, 180 degrees.

Just add the angles, then solve for x.

(2x - 10) + (x + 30) + 70 = 180

3x + 20 + 70 = 180

3x + 90 = 180

3x = 90

x = 30

50 degrees.

Step-by-step explanation:

(2x - 10) + (x + 30) + 70 = 180...combine like terms

3x + 90 = 180

3x = 180 - 90

3x = 90

x = 90/3

x = 30

m < A = 2x - 10 = 2(30) - 10 = 60 - 10 = 50

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.

b and c

step-by-step explanation: