SOLUTION: i actually have 3 questions. 1. henry wants to join a book of the month club. the first club cost $40 to join and $10 per book. The second club cost $15 per book and has no fee to

Question 378073: i actually have 3 questions.
1. henry wants to join a book of the month club. the first club cost $40 to join and $10 per book. The second club cost $15 per book and has no fee to join. how many books need to be purchased from each club for the clubs to cost the same?
they need to be in an equation.
2. A car's speed before a sudden stop can be estimated by the formula S=30gk, where S=speed of the car in mph, g= drag fact,k=length of skid mark. the drag factor during a recent crash was 0.8. What was the approximate speed of the car if it created skid marks 193 feet long?
3. A group of 3 children and 2 adults pay a total of $120 to take a karate class. A group of 5 children and 1 adult take the same karate class for $95. What is the total cost for 1 child and 1 adult to take the karate class?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
I can answer (3)
Let = cost for 1 child
Let = cost for 1 adult
given:
(1)
(2)
Multiply both sides of (2) by
and subtract (1) from (2)
(2)
(1)

And, from (2),
(2)

$10 = cost for 1 child
$45 = cost for 1 adult

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