3. Ramon is saving $7.75 per week to buy a new cell phone. The phone he wants costs $125.00. For how many weeks will he need to save his money? First, estimate your answer. Then figure out
the actual number of weeks.

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.

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.