Answer:
if its thousandths, its 4 x 10^-1. If you mean 4000, its 4 x 10^3
Step-by-step explanation:
The factored form of given equation y = x^2 + 4x - 21 is (x + 7)(x – 3)
<u>Solution:</u>
Given, equation is 
We have to factor the above equation
Now, take the expression 

"4x" can be splitted as (7 - 3)x

"21" can rewritten as 

Taking "x" as common from first two terms and "3" as common from next two terms

Taking "x + 7" as common term,

Hence, the factored form of given equation is y = ( x + 7 )( x – 3 )
He plans to work 14 hours.
Here's the equation:
490-98= 392
392 divided by 28= 14 hours
Let x be the number of cards in the $27 set, then Nicole has 2 friends that have $9 each. This makes 3 people, therefore each person gets x/3 cards. So each friend would get 1/3 of the cards.
If you solve it, you get 2=9, which is incorrect. That means there's no solution.