Question

help

Answer 1

did you mean to post a different problem? this is the one we just did ;;

Answer 2

Sorry ;o

Answer 3

just set I = 275000 and solve for x

Answer 4

80

Answer 5

so you should get 2 solutions, 80 is one of them but there's another solution smaller than 80

Answer 6

if you are using the quadratic formula be sure to apply the +/- to get the other solution

Answer 7

27

Answer 8

well done, 27 is it

Answer 9

so only 27

Answer 10

or do i put both

Answer 11

yeah, it is only asking for the smaller year

Answer 12

"youngest age"

Answer 13

so this would be 80 right because the max

Answer 14

it is asking for maximum income whereas the other problem used 275K as the income

for max/min problems, generally you will first find the axis of symmetry and then the vertex

first find x = -b/(2a)

Answer 15

okay so x wold be 275?

Answer 16

remember that x is an age so it cannot be as high as 275

Answer 17

a is the coefficient of the x^2 term and b is the coefficient of the x term

making a = -425 and b = 45500

Answer 18

-45500 / (2*-425)

Answer 19

-45500 / -850

Answer 20

good, now simplify that, then turn it to a decimal, then round to a whole numer

Answer 21

54

Answer 22

good, well done ^_^