Answer:
She didn't put the sign's in the proper place, it should be ( x + 3 ) ( x - 7 )
Step-by-step explanation:
( x - 3 ) ( x + 7 ) = x² + 7x - 3x - 21 = x² + 4x - 21
( x + 3 ) ( x - 7 ) = x² - 7x + 3x - 21 = x² - 4x - 21
The answer is 1,1500 because you ha e to subtract the lowest to highest number
Answer: 7.867 x 10^8
Step-by-step explanation:
(the “^8” is an exponent of 8)
Answer: 
Step-by-step explanation:

Begin by isolating x. To do this, you can substract 24 on both sides.


That's your answer. Any value of ''x'' must be greater than 28 for this inequality to be true.