with only using 4 fours how can I get the product of 4 without going in the negative numbers and using square roots

An ice cube with the surface area of 60 in^2 is placed in the sun. As it melts, it loses 15% of its surface area each minute. Let y be the surface area of the ice cube x minute after it is placed in the sun.

A new soft drink is being market tested. a sample of 400 individuals participated in the taste test and 80 indicated they like the taste. A. At a 5% significant level, test to determine if at least 22% of the population will like the new soft drink.

The fuel mix for a small engine contains only 2 ingredients: gasoline and oil. If the mix requires 5 ounces of gasoline for every 6 ounces of oil, how many ounces of gasoline are needed to make 33 ounces of fuel mix?

How to tell what is a geometric sequence?

A few years ago, a total of 26812681 thousand people lived in the metropolitan areas of Las Vegas, Nevada, and Sacramento, California. Sacramento had 277277 thousand more residents than Las Vegas. What was the population of each metropolitan area?

Tan154-tan49/1+tan154tan49 *all are in degrees. What does sin, cos, and tan equal?

What is the unit rate for this problem: $4.50 for 10 ounces of trail mix

the equation y=3x+7 shows the relationship between the number of days (x) and the number of stamps alex has collected (y). Predict the number of stamps he will have in 12 days.

Subtract 12x + 7 from 36 + 13

It takes Shawn 2 more hours to stain a deck than Michelle. Together it takes them 2.4 hours to complete the work. How long would it take Shawn to stain the deck by himself?