Ashley’s math average decreased 12 points to 78. Then she completed an extra credit assignment and raised her final average by 5
2 answers:
You might be interested in
Answer:
Step-by-step explanation:
We are given that
2 + (3+5 ) 2 ÷ 4 ( 1/2)^4
2 + (8 ) 2 ÷ 4 ( 1^4 / 2^4)
Applying rule of exponents which says
(a/b)^m = a^m / b^m
2 + (8 ) 2 ÷ 4 ( 1 / 16)
2 + (8) ( 1/ 2 ) (1 / 16)
2 + 4 ( 1/16)
2 + (1/4)
(8+1)/4
9/4
Answer
The big keyword here is the word RATIO. Ratio of what? The ratio of girls to boys in the entire grade. A ratio is just the two amounts divided by each other (you can also call it the slope, but ignore that if that makes it more confusing).
(81 girls)/(72 boys)
Simplify it by breaking it up a bit.
81 = 9 * 9
72 = 9 * 8
Cross out similar terms to gain the result of:
What they want from us is the ratio of girls if a group has 16 boys. So set it up like this:
Just by looking at this you may be able to solve for "x" if you have a good understanding of fractions, but instead let's do the long way.
First off is to get "x" alone by multiplying 16 boys on both sides.
x =
Remember that:
16 = 8*2
x =
Cancel out the like terms (8) to give you:
x = 18 girls
(81 girls)/(72 boys)
Simplify it by breaking it up a bit.
81 = 9 * 9
72 = 9 * 8
Cross out similar terms to gain the result of:
What they want from us is the ratio of girls if a group has 16 boys. So set it up like this:
Just by looking at this you may be able to solve for "x" if you have a good understanding of fractions, but instead let's do the long way.
First off is to get "x" alone by multiplying 16 boys on both sides.
x =
Remember that:
16 = 8*2
x =
Cancel out the like terms (8) to give you:
x = 18 girls