Answer:
Step-by-step explanation:
Josh has a collection of 1,200 music CDs. He considers 1/6 of his collection rock music. This means that the number of rock music CDs that he has is
1/6 × 1200 = 200
Of the rock music CDs, 20 percent are by solo artist. This means that the number of CDs by solo artist is
20/100 × 200 = 40
Of the solo artist 2/5 are by female artist. It means that the number done by female solo artists is
2/5 × 40 = 16
You solve the equation : t^2 - 9t - 90 = 0 ;
Δ = ( - 9 )^2 - 4 * 1 * ( - 90 ) = 81 + 360 = 441 ;
t1 = ( 9 +
) / 2 = 30 / 2 = 15 ;
t2 = ( 9 -
) / 2 = -12 / 2 = - 6 ;
The numbers are 15 and - 6 ;
Answer:
B
Step-by-step explanation:
this equation is in the form of ax^2+bx+c
so a is 4, b is -9, and c is 8
Answer:
No
Step-by-step explanation:
This is the general rule for any function, where a function cannot have more than one x value for every y value, there is only one output for every input.
You can also use the vertical line test which states that anything that hits the line more than once is not a function.
Answer:
x = 16.5
Step-by-step explanation:
2x + 3y = 73.50
5x + 2y = 109.50
(2x + 3y = 73.5) -5
(5x + 2y = 109.5) 2
-10x - 15y = -367.5
10x + 4y =219
-11y = -148.5
y = 13.5
2x + 3(13.5) = 73.50
2x + 40.5 = 73.5
2x = 73.5 - 40.5
2x = 33
x = 16.5
