The pack of pencils weighs 21.6 grams because 0.9 times 24 is 21.6
The general form of an equation is

. Solving for (5+X)(5-X)=7 by multiplying the factors and subtratcting 7 on both sides gives the equation

, so
A = 1
B = 0
C = -18
Answer:
21:27 and 14:18
Step-by-step explanation:
We can solve this by using common factors
one of the common factors of 54 and 42 is 3
42/3=14
54/3=18
so one of the ratios is 14:18
another common factor is 2
42/2=21
54/2=27
so another ratio is 21:27
Answer: A
Step-by-step explanation:
Nothing you a bum
Since A = bh
and A = 198 and b = 18?
h = A/b
= 198/18
= 11