Answer:

Step-by-step explanation:
we have the expression:

We need to multiply the two terms in the first parenthesis by the two terms in the second parenthesis:

we solve each term taking into account the law of signs
(-)(-)=+
and
(+)(-)=-
also for the first term we use that 
thus we have:

it can be simplified a little more if we factor an r of the second and third term:

Answer:
x−4
Step-by-step explanation:
Answer:
169.50
Step-by-step explanation:
Answer:
3
Step-by-step explanation:
Choose a variable to represent the number to be added to 5 and 3.

"Cross-multiply."

Check: The ratio of 5+3 to 3 + 3 is 8:6, equal to the ratio 4:3.
the answer in standard form is 10+3