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15. 0=x^2-2x-24
A. x=-6,4
B. x=-6,-4
C. x=6,-4
D. x=6,-4

X=6,-4

Step-by-step explanation:

0=x^2-2x-24

First substitute x with 6

0=(6)^2-2(6)-24

36-12-24

=0

Now try -4

0=(-4)^2-2(-4)-24

Two negative numbers time each other turns it into a positive number -4 x -4=16

24-24=0

The decrease of the decimal rate -1.05 mm/year can be rounded to -1. You don’t need to round 2.48 because you’re multiplying by -1. Since -1.05 is negative and rounded to a greater value, the estimate could be adjusted to a slightly lesser value, maybe -2.5 or -2.6.