7. Add the decimals: 23.85 , 8.94 0.087 and 314.6
8. Find the complement of
of right angle
9.
Name the following:
(1) An angle whose measure is more than 180° but less than 360°.
(ii) A line intrsecting two or more given lines in a plane at distinct points
10. Simplify (-45) + (-12-31
11. What will be the sum of an integer and its additive inverse
12. Convert into fraction and in simplest form
0.124
13. One -fourth of a number plus 3 gives 4. Find the number
14. Find the value of n if [225] = 2n +7
15. Find the perimeter of a regular octagon whose side is "a" units

7. 347.477

8. 90 percent

9. i. reflex

9. ii. diameter

10. -64

Step-by-step explanation:

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.

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign