<u><em>When x = -2</em></u>, f(x) = -7(-2) + 3 = 14 + 3
<u><em>x = 17</em></u>
<u><em>When x = 5</em></u>, f(x) = -7(5) + 3 = -35 + 3
<u><em>x = -32</em></u>
All you have to do to solve the function is substitute the value of x into the equation.
Answer: 13
Step-by-step explanation:
represent the first integer as x
Since they are consecutive, you can represent the others as x+1, x+2, and x+3.
Write the equation
x + (x +1) + (x+2) + (x+3) = 58
Combine like terms
4x + 6 = 58
Solve for x
4x= 52
x=13
2 3 5 7 9 11 13 15 17 19 21 it goes up by 2
Answer:
bra no
Step-by-step explanation:
bra
Answer:
Step-by-step explanation:
- speed = distance / time
- time = distance / speed
a)
i)
<u>Time taken at the first part:</u>
ii)
<u>Time taken at the second part:</u>
- (190 - 105) / (x + 12) =
- 85/(x + 12)
b)
<u>If time is 3 hours and 15 minutes = 3 1/4 hours = 13/4 hours, the equation is:</u>
- 105/x + 85/(x + 12) = 13/4
- 4(x + 12)*105 + 4(85x) = 13x(x + 12)
- 13x² - 604x - 5040 = 0
c)
<u>Solve the equation:</u>
- 13x² - 604x - 5040 = 0
- x = [604 ± √((-604)² + 4*13*5040) ]/26 =
- [604 ± √626896]/26 =
- [604 ± 791.77]/26
- x = (604 + 791.77)/26 = 53.68 km/h (taking positive root only)
d)
- 105/x = 105/53.68 h = 1.956 h = 1 h 0.956*60 min = 1 h 57 min (rounded)
- 85/(53.68 + 12) = 85/65.68 = 1.294 h = 1 h 0.294*60 min = 1 h 18 min (rounded)
