Twin brothers, billy and bobby, can mow their grandparent's lawn together in 97 minutes. billy could mow the lawn by himself in 45 minutes less time that it would take bobby. how long would it take bobby to mow the lawn by himself?

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.

Anormally distributed data set has a mean of 176.3 and a standard deviation of 4.2. what is the approximate z-score for the data value of 167.9? 2.00 −2.00 8.4 −8.4

3.4a=57.8 what is the the value of a