Factor.

1 answer:

soldier1979 [14.2K]3 years ago

4 0

15x^3-12x

Begin with sorting out what 15x^3 and 12x have in common

15 and 12 are both divisible by 3, so divide 3 by both 15 and 12 and put 3 on the outside.

15x^3 and 12x also both have an x in common, so divide the x's (which is basically subtracting them).

3x(5x^2-4)

B

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Explain it so I can better understand it

lorasvet [3.4K]

The question is essentially asking who's equation works better (Part A) and to explain why (Part B).
Marcella is suggesting the equation 6r + 12 = 683.88
Julia is suggesting the equation 6(r + 12) = 683.88

Six people are on the trip.
It is $12 PER person to rent a floatation device.
The total cost of the trip was $683.88.

Hope I've helped!

6 0

3 years ago

a 9ft ladder is placed 4.5 feet from the base of a wall. How high up will the ladder reach? Round to the nearest hundredth.

spin [16.1K]

Answer:

$\huge\boxed{7.79 \ \text{feet}}$

Step-by-step explanation:

We know that we have a 9 foot long ladder resting upon a wall, with an unknown height, but the ladder is 4.5 feet away from the wall.

This can be represented as a triangle, where x is the unknown side.

| \

x | \ 9

| \

|_____\

4.5

We can use The Pythagorean Theorem to find the value of x. The theorem states that $a^2+b^2=c^2$ , where a and b are the lengths of the legs and c is the length of the hypotenuse.