Robert says his better long jump was about 1 foot farther than may's better long up. is he correct? explain.

So he is wrong

Step-by-step explanation:

I think your question is missed of key information, allow me to add in and hope it will fit the original one.  

Mays jumps : 4 2/3 and 4 3/4

Robert jumps : 6 1/12 and 5 2/3

My

May:

=> May better jump is: 4.75 feet

Robert:

=> Robert better jump is: 6.08  feet

The difference between Robert's better long jump and May's better long jump is:

6.08  -   4.75 = 1.33 feet

So he is wrong, it is 1.33 feet not 1 foot

- 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

its 4 because 2 times 2 is 4, if you double the number two you get four