Not necessarily. You could have done your multiplication wrong. Or in some cases, yes, you could have to use another skill. For example, you can't solve an optimization problem with addition, you need some calculus skills under your belt.
Answer:
89%
Step-by-step explanation:
500-55=445
445/500=0.89
0.89x100=89
Answer: TRUE!
Variables ARE letters used in place of numbers absolutely
Answer: x=7
Step-by-step explanation:
2x=17-3
2x=14
X=7
