1 In a class, there are 20 men and 15 women. Find the ratio of the number of men to the number of students in the class. First express the ratio as a fraction reduced to lowest terms. Then re write the ratio using a second method.

2.Determine whether each of the ordered pair is a solution of
3x-4y>7:

(0,0), (3,-6), (-2,-5),(-3,4)

3. A chemist needs to mix a 40% acid solution with a 70% acid solution to obtain the 12 litters of a 50% acid solution. How many liters of each of the acid solutions must be used? (2 points)

4. solve the portion: 45/2 = 360/x

5.graph each equation or inequality in the rectangular coordinate system. (4 points)
a.2x-y =4

b.3x-2y<-6

6 Solve each system by the graphing method. If there is no solution or an infinite number of solutions, state so.

a)2x-3y=12
-2x+y=-8

b)3x+2y=6
3x-2y=6

7. Solve each system by the substitution method. If there is no solution or an infinite number of solutions, state so.
a) 2x-y=6
x=13-2y

b) 3x+4y=-13
5y-x=-21

8.Solve each system by the addition method. If there is no solution or an infinite number of solutions, state so.

3x-4y=1
12x-y=-11

9. Health experts agree that cholesterol intake should be limited to 300 mg or less a day. Three ounces of shrimp and 2 ounces of scallops contain 156 mg of cholesterol. Five ounces of shrimp and 3 ounces of scallops contain 45 mg of cholesterol less than the suggested maximum daily intake (300 mg). Determine the cholesterol content of an ounce of each item.

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