Some SAT I Math Problems that I don't know how to solve.

powerbomb
Fri, 27 Nov 2009 21:16:38 +0000

Help/explanation of the correct answer to any of these questions would be appreciated.

1) A car traveled 10 miles at an average speed of 20 miles per hour and then traveled the next 10 miles at an average speed of 40 miles per hour. What was the average speed, in miles per hour, of the car for the 20 miles? (Grid-in type of question)

2) Set S consists of the positive multiples of 6 that are less than 50, and set T consists of the positive multiples of 8 that are less than 50. How many numbers do sets S and T have in common?
a. none
b. one
c. two
d. four
e. eight

3) A certain ice-cream parlor offers 6 different toppings for sundaes. How many combinations of 2 different topping from those offered are possible?
a. 6
b. 12
c. 15
d. 36
e. 64

4) For a certain tire, the manufacturer recommends that the air pressure be between 30 and 34 pounds per square inch. If x pounds per square inch is the air pressure in a tire that meets this recommendation, which of the following represents all possible values of x?
a. |x-32| < 2
b. |x+32| < 2
c. |x-32| > 2
d. |x+32| > 2
e. |x-32| = 2