1 Evaluate if $a=3$ , $b=-5$ , and $c=2$

2 A bike wheel has a circumference of 50 inches. What is the length of its diameter to the nearest hundredth? Use $C=\pi d$ and $\pi \approx 3.14$

3 ${\sqrt {49}}$

4 $-3.84$

5 $6-(-3)$

6 ${\frac {2\times 5}{4}}+{\frac {3}{2}}$

7 $2(x+3)=2x+6$

8 $5y-4=-4+5y$

9 $3m+(2+m)=(3m+2)+m$

10 $a\cdot {\frac {1}{a}}=1$

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14 Melvin buys several books stamps, each stamp costs $0.39 and each book contains one dozen stamps (the cost of one book is equal to the price per stamp times the total number of stamps in it.) He pays a total of $24.80 ($1.40 sales tax is included in the final price). How many books of stamps did Melvin buy?

15 $|3y-4|+5=10$

16 $2y-4>3$

17 $-7x<35+3x$

18 ${\frac {32}{-x-2}}\ >4$

19 All students at Central High School need a minimum of 40 credits to pass each year. Jack takes seven courses in one year, one of which is worth four credits. What must the minimum credit value of each of the other six courses be if Jack plans to pass this year?