Starting a home omar traveled uphill for 30 minutes at just 10mph. he then traveled back home along the same path downhill at a speed of 30 mph. what is his average speed for the entire trip from home to the gift store and back

20 mph

Step-by-step explanation: To find an average, you add all the relevant numbers up and then divide the answer by how many numbers you have. In this case, it would be (10+30)/2, which is 20. Therefore, the answer is 20 mph.

i did it myself and i got 4.2 (b) hope its right

step-by-step explanation:

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.