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factor n^2-10n+24

Factors of 24 that would also add up to -10 would be -12 and 2 soo. you would factor out the n's to get:
(n-12)(n+2)

Your question is : -

n² - 10n +24

we split -10 n into two numbers such that product is 24 and sum is -10n. We find the numbers be -6 and -4.

n² - 6n - 4n + 24

= n(n-6) - 4(n-6)

= (n-4)(n-6)

Short

a/(21÷12= 1.75 pound per dollar)

b/[10÷81= 0.12 mile per minute]

long answer and explanation:

a/
(21÷12= 1.75 pound per dollar )
that's the only answer you need ( )

to double check and make sure:

1.75×12= 21 pound

b/
81÷10= 8.1
one mile every 8.1 minutes

but for 1 minute
1÷8.1= 0.12 mile per minute.

another way same answer
[10÷81= 0.12 mile per minute]
that's the only answer you need [ ]

hope that helps..
:)