Answer:
x=7
Step-by-step explanation:
unknown number = x
x - 7 = 0
(add 7 to both sides)
x=7
Answer:
n=24
Step-by-step explanation:
add 4 to both sides
Answer:Mark Is 9 years old; Christine is 5 years old
Step-by-step explanation:
Present age
LET mark age be x
Christine be x-4 yrs
In 3 yrs Time
Mark will be x+3 yrs old
Christine will be (x -4 +3) = x-1 years old
Also, In 3 years time
Christine = 2/3 Mark
such that
x-1 = 2/3(x+3)
x -1= 2x+6 / 3
3x -3= 2x+6
3X--2X = 6+3
=X=9
Mark Is 9 years old
Christine is x -4 = 9-4=5 years old
what dou you need?????????
Answer:
Step-by-step explanation:
b·b·b= b³