Elena walked 15 miles because 1/4 of 12 is 3 and 12+3= 15
Answer:
-28
Step-by-step explanation:
2(1) + (-5)6(1)
2+-30
-28
To find the mean, add all the numbers then divide by the amount of numbers there are to find the average.
210+160+200=570
570÷3=190
Answer: 190
Use the half angle identity, tan157.5=(1-cos315)/sin315
cos315=cos(-45)=√2/2, sin315=-√2/2
tan157.5=(1-√2/2)/(-√2/2)=(2-√2)/(-√2)=(2√2-2)/(-2)=1-√2
