Can someone me in algebra 100% correct only

Combine like terms to make a simpler expression 3z+z

Match the vocabulary to the proper definition. in probability, two events in which 1. conditional probability the outcome of one event is independent of the outcome of a second event. 2. dependent events in probability, two events in which the outcome of one event is dependent on the outcome of a second event. the probability of an event in which the outcome of the event is conditional on the outcome of one or more different events. 3. independent events

Lana's family entered a 5-kilometer race lana's average step length is about 0.5 meter how many steps will she need to take the finish