The difference of the square of a number and three times the sum of the number and 7 is more than the product of that number and 15.

select the inequality that can be used to determine the unknown number.

a.
x2 - 3x + 21 > 15 + x
b.
x2 + 3x ≥ 15 + x
c.
x2 - 3x + 7 ≥ 15x
d.
x2 - 3x - 21 > 15x

c hope this helps btw im

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Step-by-step explanation:

square of a number =x²

3 times the sum of the number and 7= 3(x+7)

their differences=x²-3x-21

more than product of number and 15= >15x

so x²-3x-21>15x

b.) 160 miles on a 5 gallons car

step-by-step explanation:

240/10=24 miles/gallon

160/5=32 miles/gallon

30/1=30 miles/gallon

168/6= 28 miles/gallon

32 miles/gallon is the most amount, so this is the best.

it is not that hard all u have to do is plot the graph

step-by-step explanation: