Rex's class raised frogs from tadpoles. the class has 21 students, and each class raised 6 tadpoles. all but six of the tadpoles grew to be frogs. write a number sentence to show how many frogs the class has.

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

What are the soultion(s) to the quadratic equation 40- x^2=0

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?