Answer:
hello
Step-by-step explanation:
Roberto overtakes Juanita at the rate of (7.7 mi)/(11 h) = 0.7 mi/h. This is the difference in their speeds. The sum of their speeds is (7.7 mi)/1 h) = 7.7 mi/h.
Roberto walks at the rate (7.7 + 0.7)/2 = 4.2 mi/h.
Juanita walks at the rate 4.2 - 0.7 = 3.5 mi/h.
_____
In a "sum and diference" problem, one solution is half the total of the sum and difference. If we let R and J be the respective speeds of Roberto and Juanita, we have
R + J = total speed
R - J = difference speed
Adding these two equations, we have
2R = (total speed + difference speed)
R = (total speed + difference speed)2 . . . . . as computed above
-x+xy +4xy-x2
-2x2+5xy
C.-2x2+5xy
30x! That was simple! Steps are shown below in case you need them!
5(6x)
(Now, you multiply 5*6)
30x
Bam!
$30x$
30x is da answer.
Hope that helps! Be sure to let me know if it does not!
Answer:
100
Step-by-step explanation:
1=ad=100
and I need more characters so don't mind me.
