Answer:
The answer is "(8x + 6) units".
Step-by-step explanation:
Formula of perimeter is:


Answer:
142.5
Step-by-step explanation:
150/x=100/95
95*150/100=
142.5
He should use 48 tablespoons of flour in his recipe.
Answer:
66
Step-by-step explanation:
Use the formula for the mean of a set of numbers:
sum of the numbers
average = --------------------------------
count of numbers
Here we know that the average mark was 68, so we can write:
75 + 62 + 84 + 53 + x
average = 68 = ----------------------------------
5
or 274 + x
68 = -------------------
5
Solving for x, we multiply both sides by 5: 340 = 274 + x.
Subtracting 274 from both sides effectively isolates x:
340 = 274 + x
- 274 -274
------------------------
66 = x
The fifth student's mark was 66.
The additive inverse of something is whats added to the original to get 0
So in this case n - n = 0, which is B :)