Question 14 of 20
1 Point
Which of the following best describes significant figures?
O
A. The exactness of a measurement
O
B. The digits in a quantity that are known with certainty, plus one
estimated digit
C. How close a measured quantity is to its actual value
O
D. An approximate guess or rough calculation

The answer is C. How close a measured quantity is to its actual value

The significant figures of a number are digits that carry meaning contributing to its measurement resolution. The basic concept of significant figures is often used in connection with rounding. Rounding to significant figures is a more general-purpose technique than rounding to n decimal places, since it handles numbers of different scales in a uniform way.

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.