4x+30=90
4x = 60
x = 15
answer is B. 15
Answer:
My age is 78 years.
Explanation:
Define my age first as a variable.
Let my age be
x
years.
Reduced by means subtracted.
Subtract twice my age from 400 to get 244:
400
−
2
x
=
244
400
−
244
=
2
x
←
make x positive and isolate it.
156
=
2
x
78
=
x
Step-by-step explanation:
Answer:
F.
Step-by-step explanation:
20=4*5
9=4+5
