Simplify to a single term cos(90° + x). tan(540° + x) cos(180° - x)+sin(- 90°)​

Idont get this question can someone me solve it? ** the distance light travels in one second (1 light second) is about 1.86 ×10^5 mi. saturn is about 475 light-seconds from the sun. about how many miles from the sun is saturn..my guess is 8.83* 10^7 you so much

15/16 as a decimal rounded to the nearest hundredth

Study results indicate that the mean length of time people spend on a bus in a city is between 21.2 min and 24.5 min what is the study margin of the error?