Where the heck did x come from!
1)

2)

Here, the variable

can assume any value, and usually an inequality presented like this has

as a stand-in for all real numbers. If we really wanted to make that fact clear, we could write the two inequalities like this:

Formally, you'd read

as "

is an element of the set of real numbers," which is a fancy way of saying that

can be any real number.
24=2*12
P=2*(l+L)
⇒ L+l=12
⇒ for a maximum area l=5, L=7
Area=5*7=35
Answer:
A then B
Step-by-step explanation:
1440≈1,000, and 1,000=10^3
1000000/1440≈700, and 700≈1,000. 1,000=10^3
Answer:
80%
Step-by-step explanation:
Percentages are usually found by taking the value that you want to find and dividing it by the whole amount (100% of the total value available). In this case, getting 100% on the test would mean getting 120/120, because 120 points is 100% of the points available. However, the student only got 96 points out of the whole 120 points, so to find the percentage, you do 96/120 to find what part of 96 comes out of 120. Then to convert to percentage, multiply that value by 100 to get your finale value.