In a math class with 5 tests, you must receive at least 120 points to get a B- in the class. Your first four test scores were 24, 20, 28, and 30. What must you receive on the last test to receive at least a B-?
>= 18
100
lx + 8l = 2
x = -6, -10
100
2.3x + 9.2 = 23
x = 6
100
The second angle of a triangle is four less than the first, and the third angle is four more than twice the first. What are the angles of the triangle?
45, 41, 94 degrees
100
3x + 2 < -7 or 3x + 2 > 5
x < -3 or x > 1
200
A car salesman can be paid in two ways.
Plan A: $55,000 plus $1200 per car sold
Plan B: $67,000
How many cars can the salesman sell to make Plan A better than Plan B?
> 10 cars
200
l5x - 3l = 14
x = -11/5, 17/5
200
(1/5)x + 3 = (1/3)
x = -40/3
200
The sum of half a number and fifteen is six more than the number. What is the number?
18
200
-3 < x + 8 < 21
-11 < x < 13
300
A policeman can be paid in two ways.
Plan A: $5000 plus $325 per speeding ticket given
Plan B: $7000 plus $200 per speeding ticket given
How many speeding tickets can the policeman give to make Plan B better than Plan A?
< 16 speeding tickets
300
l2x + 4l < 4
-4 < x < 0
300
(1/2)(3x - 5) + 2 = (1/7)(12x + 3)
x = -13/3
300
The sum of twice the number, three less than the number, and five is 4 less than four times the number. What is the number?