Answer:
c
Step-by-step explanation:
Answer:
z = 4
y = -1
x = 2
Step-by-step explanation:
x - y = 3
Therefore => x = 3 + y
y + 2z =7
Therefore => y= 7 - 2z
We have the equation :
2x + 3y + 4z = 17
2(3 + y) + 3(7 - 2z) + 4z = 17
6 + 2y + 21 - 6z +4z = 17
2(7 -2z) - 2z + 27 = 17
14 - 4z - 2z + 27 = 17
-6z + 41 = 17
-6z = -24
z = 4
Edited answer:
________________
-3.0 <span>÷ 1 = 3.0 ; is an answer.</span>
Answer:
20.54%
Step-by-step explanation:
the first thing to know the percentage change, is to notice if the average increased or decreased, if it was initially 73 and then 88, we can say that increase, therefore the change is positive, now to calculate the exact change we must calculate the quotient of these numbers:
88/73 = 1.2054
which means that 0.2054 is the proportion of increase, to pass it to a percentage we must multiply by 100, that is:
0.2054 * 100 = 20.54%
which means that the percentage change was 20.54%
