Find the value of the expression 4a4 − 2b2 + 40 when a = 2 and b = 7.

a. 6
b. 39
c. 74
d. 202

Emma will roll two number cubes labeled 1 through 6. she will record the sum of the two numbers after each roll. she will roll the two cubes 540 times. how many times should emma expect the sum to equal 5?

Can someone tell me if this is perpendicular? !

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?