Answer:
60
Step-by-step explanation:
sum the parts of the ratio, 8 + 12 = 20 parts
Divide the total by 20 to find the value of one part of the ratio
100 ÷ 20 = 5 ← value of 1 part of the ratio , thus
8 parts = 8 × 5 = 40 ← number of purple bikes
18.75÷5=3.75
12.75÷3=4.2
The pack of 5 books has the lower cost per book
Answer:
141, meaning that there will be two real solutions
Step-by-step explanation:
The discriminant of a quadratic is
, which in this case is:

Since the discriminant is positive and not zero, there will be two real solutions to this equation. This is because when the discriminant is negative, and you take the square root of it, you get a negative number. If you take the square root of 0, you get 0, which means that there will only be one solution to the equation.
Hope this helps!
3x^2 = 2(x + 4)
3x^2 = 2x + 8
3x^2 - 2x - 8 = 0
(3x + 4)(x - 2) = 0
3x + 4 = 0
3x = -4
x = -4/3
x - 2 = 0
x = 2
solution is : x = -4/3 or x = 2 <==
Answer:
28 students
Step-by-step explanation:
Work backwards.
First, subtract 3:
115 - 3 = 112
Then, divide by 4:
112 ÷ 4 = 28
So, there are 28 math students in his class.