A boy uses a homemade metal detector to look for valuable metal objects on a beach. The machine isn't perfect-it identifies only
98% of the metal objects over which it passes, and it identifies 4% of the
nonmetallic objects over which it passes. Suppose that 25% of the objects
that the machine passes over are metal. Choose an object from this beach
at random. If the machine gives a signal when it passes over this object,
find the probability that the boy has found a metal object.

Adriveway is 60-feet long by 6-feet wide. the length and width of the driveway will each be increased by the same number of feet. the following expression represents the perimeter of the larger driveway: (x + 60) + (x + 6) + (x + 60) + (x + 6) which expression is equivalent to the expression for the perimeter of the larger driveway? a) 2(x + 66) b) 4x + 33 c) 4(x + 33) d) 4(x + 132)

Can someone me with this problem i don't understand i need

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels.ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0