You need to find the total distance and the total time. The total distance is two times the distance to school, 2d.s=d/t=>t=d/sWhere s is speed, d is distance and t is time. So the time taken to get to school is:d/s1and the time taken to get back is:d/s2so the total time is:d/s1+d/s2=d(1/s1+1/s2)So, as speed = distance/time, divide the total distance by the total time:2d/d(1/s1+1/s2)=2/(1/s1+1/s2)=2/(1/20+1/40)=80/3≈26.7km/hr
Answer:
75.36 feet
Step-by-step explanation:
The formula for circumference is C=2xpixr. Diameter is two times the radius so the radius is 12 feet. If we plug everything in, then 2 times pi equals 6.28 times 12 equals 75.36 feet.
Hope this Helps!!! PLZ MARK BRAINLIEST!!!
A=4*<span>π*r^2
A=4*</span><span>π*2^2
=50.3</span>
I'm going to assume the 4 and 3 are exponents and the expression is 
.
The first step is to separate the coefficients of 3 and -6 from the variables and to multiply those as normal:
As for the variables, you want to recognize that 
means 
and 
means 
, so
In total, there are 7 a's being multiplied, so
Putting this all together, we have:
