Answer:
3x+12
Step-by-step explanation:
-0.5x*2+4x+12
Multiply 0.5x*2=x
= -x+4x+12
Add similar elements -x+4x+12
= 3x+12
The difference of the helicopter and the submarine being 18.5 meters makes 18.5+-7.75=10.75
Answer: 554
Step-by-step explanation:
If prior population proportion is known, then the formula to find the sample size is given by :-

As per given description, we have
p= 0.1
E=0.025
Critical z-value for 95% confidence : 
Then,

Hence, the minimum sample size required = 554.
Answer:
This is quadratic trinomial
Step-by-step explanation:
It has x^2 (square) and consists of 3 parts
Well, you need to add 28 to 1880558 which equals 1,880,586.