Answer:
x = 3.5 + 0.5y
Step-by-step explanation:
Simplifying
2x + -1y = 7
Solving
2x + -1y = 7
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add 'y' to each side of the equation.
2x + -1y + y = 7 + y
Combine like terms: -1y + y = 0
2x + 0 = 7 + y
2x = 7 + y
Divide each side by '2'.
x = 3.5 + 0.5y
Simplifying
x = 3.5 + 0.5y
Answer:
b. 9/100
Step-by-step explanation:
It helps if you have memorized the cubes of small integers. Of course, the ones needed here are ...
3³ = 27
10³ = 1000
The desired value can be simplified to ...
7x+70=98
7x=28
x=4
this is the answer
So
if increase by 10%, that means times 1.1
sub 1.1r for r in
V=(4/3)pir³
so
nV=(4/3)pir³
nV=(4/3)pi(1.1r)³
nV=(4/3)pi1.331r³
nv=((4/3)pir³)1.331
V=(4/3)pir³
nV=(V)1.331
x times 1.331 is about a 33% increase