Carry out the mult.: f(x) = -[x^2 - 21x + 9x - 189]
Combine like terms: f(x) = -[x^2 - 12x - 189]
Eliminate the brackets [ ]: f(x) = -x^2 + 12x + 189
Identify coefficients a, b and c: a= -1, b=12, c=189
The equation of the axis of symmetry is x = -b/(2a), which here equals
x = -(12)/[2(-1)], or x = 6
This is also the x-coordinate of the vertex. Plug x=6 into the original equation to calculate the y-coordinate.
Answer:
D (4,11)
Step-by-step explanation:
Answer:
C
Step-by-step explanation:
10 mins = 1 miles
1 hour = 1 x 6 = 6 miles
8 hours = 6 x 8 = 48miles
The jogger could cover 48 miles a day.
3987 ÷ 48 = 83.06 days
It takes 83.06 days to jog the length of this frontier.
83.06 days ÷ 7 = 11.87 weeks = 12 weeks (round to the nearest whole number)
It takes 12 weeks to jog the length of this frontier.
Answer:
67%
Step-by-step explanation:
First of all, we must find the decrease;
39 - 13
=26
Then we can find the percentage decrease
26/13 ×100 =66.666..which can be written as 67.
