15% is 10% + 5% (or 0.15 = 0.1 + 0.05, dividing each percent by 100). Thinking about it this way is useful for two reasons. First, it's easy to multiply any number by 0.1; just move the decimal point left one digit.
Answer:
$10.50, the difference is $4.50
Step-by-step explanation:
a) 4/9*x^4
b) 2/y
true because both other number is divisible by 21 other than 1,3,7 and 21
I think the answers is 27, just add all of those squares.
