Hiro rolls a fair pair of six-sided dice. The sample space of all possible outcomes is shown below.
Let A be the event that the first die is one and B be the event that the sum of the dice is eight.
What is P(A or B), the probability that the first die is one or the sum of the dice is eight?

What is the ratio for the surface areas of rectangle prisims shown below given that they are similar and that the ratio of their edge lengths is 7: 3

Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?