To solve this, we have to simplify these numbers by adding like terms.
Next, we factor our expression. To do so, we look for the greatest common factor of 42 and 14, which is 14. We know that because 42 divided by 14 is 3.
No :) :) :) :) :) abcdefghijklmnopqrstuvwxyz
Answer:
36 mph
Step-by-step explanation:
The appropriate relations are ...
time = distance/speed
speed = distance/time
Suppose the race has a total length of 360 miles. Then half the race is 180 miles.
The cyclist's time on the first half is (180 mi)/(30 mi/h) = 6 h.
The cyclist's time on the second half is (180 mi)/(45 mi/h) = 4 h.
The total time is 10 h for the total distance of 360 mi, so the average speed is ...
(360 mi)/(10 h) = 36 mi/h
_____
The length of the race doesn't matter. The above numbers make the math convenient. The average is computed from ...
1/((1/2)/30 + (1/2)/45) = 2/(1/30 +1/45) = 2·30·45/(30+45) = 36
This is the <em>harmonic mean</em> of the numbers 30 and 45.
50+20=70
Have a great day:)
A parallelogram is a polygon that has opposite side parallel and congruent. If you already know that two of the side lengths is 8 cm and 9 cm, the other two sides will also be 8 cm and 9 cm because it has 2 pairs of congruent sides. 8+8+9+9=34 cm for the perimeter.
