Answer:
( 5x-9) (5x+9)
Step-by-step explanation:
25 x^2 - 81
Rewriting
(5x)^2 -9^2
This is the difference of squares
a^2 -b^2 = ( a-b)(a+b)
(5x)^2 -9^2 = ( 5x-9) (5x+9)
Answer:
she will have spent 21 hours on the phone
Step-by-step explanation:
6 hours in 2 days
6 divided by 2
3 hours a day
7 days a week
3 multiplied by 7 = 21
Answer:
A
Step-by-step explanation:
It actually trying to trick you with a double negative
Answer:To make 5 batches, Jude needs to use 20 packages of pre-mixed mortar.
Jude uses 9 quarts of water to make 3 batches of cement
If jude uses 16 packages of pre-mixed mortar, he will need to use 12 quarts of water
To make 0.5 batch of cement , Jude should use 2 packages of pre-mixed mortar
Step-by-step explanation:
