What are the four arithmetic means between -10 and 35?
1 answer:
You might be interested in
Answer:
54mph
Step-by-step explanation:
<u>The</u><u> </u><u>average</u><u> </u><u>speed</u><u> </u><u>at</u><u> </u><u>2</u><u>n</u><u>d</u><u> </u><u>departure</u><u>.</u>
⠀
The speed during 90 miles travel = 70mph
The average speed during the entire journey = 63mph
The distance in second departure = 70 miles
⠀
⠀
⠀
The distance travelled in the entire journey
= 90 + 70 = 160 miles.
⠀
Then the time taken in entire journey will be
⠀
⠀
Time taken at first departure
⠀
⠀
Time taken in second departure
= 2 hours 35 minutes - 1 hour 17 minutes
= 1 hour 18 minutes
⠀
⠀
Speed at second departure will be
⠀
⠀
⠀
The average speed at second departure was 54mph.
Answer:
- (4+2sqrt10)/3
Step-by-step explanation:
The only reason this problem needs to be worked on is that you can't have a radical on the bottom of a fraction(rational expression) . We'll use the CONJUGATE of the denominator(expression on the bottom) to get rid of the radicals.
The conjugate has the same terms as the bottom expression, but it has the OPPOSITE sign in between. Your question has
(root2 - root5). Then the CONJUGATE is
(root2 + root5).
We can't just randomly change the denominator of a number, so we will have to multiply the top by
(root2 + root5) also.
see image.
Multiplying these terms is very similar to multiplying binomials. Use distributive property or, if you know the method, FOIL. You may have learned a box method. This multplication is shown with the arrows in the attached image.
see image.
