How many real roots does the following equation have?

x4 - 81 = 0

91.8% of 648 toy robots on an assembly line will be approved by the quality control inspector. Write and solve a proportion to find how many robots will be approved.

Is 40 a reasonable estimate of a quotient for 78,114 divided by 192? Explain your reasoning.

My dog, Stella, is playing in the park and sees a tree 100m away. Since she is the dog of a mathematics teacher, she knows how to calculate the angle of elevation to the top of the tree and finds it to be about 25 degrees.

Mr. Cooper is making homework packets. He will put 6 worksheets in each packet. There are 18 worksheets. How many packets can he make?

The precision of a voltmeter is ±0.005 V. The accepted value for a measurement is 9.016 V. Which measurement is in the accepted range? 9.005 V 9.006 V 9.018 V 9.025 V

A hybrid car averages 610 miles on a 12.1 gallon tank of gas. Manuel is planning a 1270 dash mile vacation in his hybrid car. Find how many gallons of gas he can expect to burn.

What is 5 divided by 29.05

4500 people ride the city bus every day on average about how many people ride the bus each hour

12.33 to the nearest tenth

How are chords and secants alike? How are they different?