13. Ship A is 15 miles east of P and is moving west at 20 mph; ship B is 60 miles south of P and is moving north at 15 mph. At what rate is the distance between them changing after 1 hour? Is the distance

increasing or decreasing?

14. Two cars start at same time from the junction of two roads one on each road, with uniform speed v m. p.h. If the roads are inclined at 120°, show that the distance between them increases at the rates of√3 v. m.p. h.

guess at question:

a vertical line intersects the graph of g(x,y) = 0 at two points. what conclusion follows about the function f(x) implicitly defined by g(x,f(x)) = 0?

the domain of f(x) cannot include the x coordinate of any such vertical line.

informally, f(x) is not a function, and

g(x,y)=0 cannot be solved for y uniquely.

the relation r = {(x,y) such that g(x,y) = 0} is a function if

for all (a,b) ∊ r and (c,d) ∊ r, a=c implies b=d.

step-by-step explanation:

so the possibilities of the measurement of the side of the triangle are either it is longest side or not the longest side

when it is the longest side

s < 25 + 35s < 60

if it is not the longest side

35 < 25 + s10 < sso 10 < s < 60so the perimeter70 < p < 130

the correct answer is the last option