How does energy travel in a mechanical wave? a. in a medium b. in space c. in time d. in a vacuum

The answer is In a medium

Step-by-step explanation:

Mechanical waves are waves that require a medium in which to travel, this involves a transfer of kinetic energy from one place to another in the material.

d. 8

step-by-step explanation:

the given radical expression is:

we can rewrite this as:

we express as square numbers to get;

the exponents will now cancel out to give.

the correct answer is d

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.