Please help as soon as you can .

Step-by-step explanation:

let's find the circumference of the semi circle. as it's a parallelogram opposite sides are equal. therefore 2 semicircles will have the same circumference

circumference of circle = 2pi r

circumference of half circle = half of circle= pi r

circumference of half circle = 22/7 × 4 ( diameter is 8 therefore radius is half of that)

circumference of half circle = 88/7

this image has 2 half circles with same radius

now find the perimeter of total figure

perimeter= 9+ 9+ 88/7 +88/7

= 18 + 176/7

= 18+ 25.14

= 43.14

to nearest tenth place = 43.1

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.