The ratio of the number of adults to the number of students in a bus is 7:5.If there are 15 children in the bus, how many adults are there in the bus?

There are 21 adults on the bus with 15 children.

Step-by-step explanation:

Since the ratio of adults to students is 7:5, use this to find how many adults are with 15 children.

7:5

?:15       You can see that you multiply the original number by 3 to get the new number

5 x 3 = 15  Which is what you know

7 x 3 = 21

There are 21 adults on the bus with 15 children.

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- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

the answer will be the last one