Answer:
12 miles per hour
Step-by-step explanation:
Let speed of boat in still water be "x"
and speed of current be "c"
So, downstream rate would be "x + c"
And, upstream rate would be "x - c"
Now, given c = 4
We can use the distance formula, D = RT, where
D is distance, R is rate, and T is time
to solve this.
Downstream:
D = RT
92 = (x+4)(t)
Upstream:
D = RT
46 = (x-4)(t)
Both the times are same, we can equate both the times. Lets simplify first:
t = 92/(x+4)
and
t = 46/(x-4)
Equate:

Now, cross multiply and solve for x to get our answer:

Speed of Boat (in still water) = 12 mph
I don’t really understand for question 11 to 13
Answer:
Dale invested in fund B $8,000
Step-by-step explanation:
We can arrange the given information into the nex equation:
4000*5% + x*2% = (4000+x)*3%
4000*0.05 + 0.02x = 4000*0.03 + 0.03x
200 + 0.02x = 120 + 0.03x
200 - 120 = 0.03x - 0.02x
80 = 0.01x
x = 80/0.01
x = 8,000 He invested in fund B.
Winter
Winter comes after fall in the pattern as we see already. Because this is true, winter is next.