A restaurant listed its prices for a medium pizza based on the number of toppings in the table below Number of topping - cost
2 $13.80
4 $18.60
5 $21.00

Based on the table , what is the cost for a medium pizza with 1 topping ?

I’m stuck on this equation, anyone got the answer?

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?