Answer:
x= -7 , 3
Step-by-step explanation:
x^2 + 4x + 4 = 25
I will use completing the square. The left side is a perfect square
(x+2) ^2 = 25
Take the square root of each side
sqrt((x+2) ^2) = sqrt(25)
x+2 = ±5
Subtract 2 from each side
x+2-2 = ±5 -2
x = ±5 -2
x =-5-2 x = 5-2
x = -7 x = 3
Answer:
a) 320 students
b) 25 students
Step-by-step explanation:
Number of 18-years old in the survey:
(We add all frequency points for each line)
0 + 30 + 20 + 60 + 70 + 40 + 60 + 40 + 0 = 320 students
Number of 18 year old spending between 25 and 35 minutes: 40 + 65 = 105
Number of 12 year old spending between 25 and 35 minutes: 30 + 50 = 80
105 - 80 = 25 students
Percent is a ratio where we compare numbers to 100 which means that 1% is 1 divide by 100
Answer:
5136
Step-by-step explanation:
2*10-4 = 20-4 = 16
3*107 = 321
16*321 = 5136
Answer:
c. no real solutions
Step-by-step explanation:
because the x's will not be there