Answer:
c) x=2
Step-by-step explanation:
2.5(6x-4)=10+4(1.5+0.5x)?
=15x-10=10+6+2x
=15x-2x=10+6+10
=13x=26
=13x/13=26/13
=therefore X=2
X^2+7x-7x-49
Simplified = x^2-49
Answer:
Yes, it is a valid random sample for if I were to randomly survey 50 people from the phone books of 20 randomly chosen cities.
Step-by-step explanation:
Because a random sample, means, the following: a subset of a statistical population in which each member of the subset has an equal probability of being chosen. And the randomly survey 50 people from the phone books of 20 randomly chosen cities matches this meaning.
