7. A. -18 cm, because it changes -3 cm/per year, so multiply 6 years by -3 cm to get -18 cm
8. D. $20, because it rose +$2 over 10 days, you multiply 10 days by $2 to get $20 total
About 10 gallons is your answer
16x^2=9
x^2=9/18
x=sqrt(9/16)
x=3/4,-3/4
so the root of the quadratic equation are 3/4 and -3/4
Answer:
1. 88 - b
Since there is 88 birds and a few of them flew away. You know b represents the amount of birds present.
2. 73 + d
Since he is earning d (amount of dollars) so what you have to do is add the amount of dollars, d, to the orginial amount, which is 73.
3. 23 x g
Since Kurt has 23 miles. If he drives 23 miles to a gallon and we have g gallons then we would multiply to find how far he can drive.
