What do you do when you don't know what X is

A certain species of fish is to be introduced into a lake, and wildlife experts estimate the population will grow to P (t) = (715) 4t4, where t represents the number of years from the time of introduction.

A fish tank needs 10 gallons of water in order to fill it up. How many quarts are in a 10 gallon fish tank?

You're given two side lengths of 10 centimeters and 8 centimeters. The angle between the sides measures 40°. How many triangles can you construct using these measurements? Answers = 0, 1, 2, infinitely many

The perimeter of a rectangle is 53 meters. The length is 2.3 Meters longer than the width. What is the width of the rectangle?

Yesterday, the price of a loaf of bread at five supermarkets was $1.54, $1.69, $1.79, $1.57, and $1.71, but today each supermarket raised its price by $0.05. What is today's mean price of a loaf of bread at the five supermarkets? A. $1.71 B. $1.76 C.

Sa triangle has a base of 35cm and an area of 819 square centimeters. What is the height if the triangle?

The graph represents a distribution of data. What is the mean of the data? 35 40 45 50 55 60 65 X

5=2/3x what does x equal

Ryan earns $5 for each small dog he walks and $8 for each large dog he walks. Today he walked 8 dogs and made a total of $55. How many small dogs did Ryan walk?

Paula's age is 4 times Mary's present age. In 6 years time, the sum of their ages will be 57 years. Find their present ages.