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10699986I don't understand 12-16 I have been sitting here for over 3

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18. A boat
1.5
6/19
4. From 1960 to 1990 the cost to administer social and economic programs rose from $1.9
billion to $16 billion. The cost in billions can be modeled by f(x) =0.47x-919.3,
where x is the year. Solve numerically or graphically for when the cost was $6.6 billion.
5. Medicare costs in billions of dollars may be modeled by f(x) =18x-35, 750, where
1995 x 5 2007. Estimate the years when Medicare costs were from 250 to 340 billion
dollars.
6. Solve 4-2x =1+x graphically.
7. Solve 4x-3<5+2xgraphically and numerically.
8. Solve graphically and numerically:
5 x -1 = 2.
9. Solve -4<2x+6<12 graphically.
10. Solve the system graphically. Determine whether the system is consistent or inconsistent.
a.
xty = 6
x - y =-2
4x+ 2y =1
x-y=4
b.
-2x + 2y = 4
C.
2x+ y= 5
11. Solve the system numerically.
a.
3x+ y = 7
4x + 2y =-6
6x+ y =16
b.
3x - y =-7
12. The sum of two numbers is 25 and their difference is 10. Find the two numbers.
13. A student takes out two loans, one at 5% and the other at 7% annual interest. The total
amount for both loans is $7700 and the total interest after one year is $469. Find the total
amount for each loan.
14. At first an athlete runs at 8 miles per hour and then runs at 10 miles per hour, traveling
12.8 miles in 1.4 hours. How long did the athlete run at each speed?
15. The length of a rectangle is 5 feet longer than twice its width. If the rectangle has a
perimeter of 88 feet, what are the dimensions of the rectangle?
16. During strenuous exercise, an athlete burns 1 1.5 calories per minute on a stair climber
and 9 calories per minute on a stationary bicycle. In a 30-minute workout the athlete
burns 290 calories. How many minutes are spent on each type of workout equipment?
8
NId

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