Answer:
See below
Step-by-step explanation:

Amount of decreased water = 3/10
Then, it would be 3/10 * 100 = 30%
So, your answer is 30%
Answer:
The answer is 15.
Step-by-step explanation: To find the answer you have to think of a number line and think how many spaces do I have to jump to get to seven from negative eight.So you have to add eight just to get to 0. Now add 7 to get to 7. Together it equals 15.
Answer:
A
Step-by-step explanation:
line 1 is perpendicular to line 2 because of 90°.
line 2 is parallel to line 3 because of corresponding angles
X/2 - 6 = 15
x/2 -6 +6 = 15 + 6
x/2 = 21
x/2 × 2 = 21 × 2
x = 42
Check
42 ÷ 2 - 6 = 15
42 ÷ 2 = 21 -6 = 15