Let c be a positive number. a differential equation of the form

dy
dt= ky1 + c
where k is a positive constant, is called a doomsday equation because the exponent in the expression ky1 + c is larger than the exponent 1 for natural growth.

(a) determine the solution that satisfies the initial condition

y(0) = y0.

ans: y=(-ckt+y0^-c)^(-1/c)

(b) show that there is a finite time
t = t
(doomsday) such that
lim t %u2192 t%u2212y(t) = infinity.
ans: y(t) --> infinity as 1-cy0^ckt--> 0 as t--> 1/cy0^ck
t=1/cy0^ck, them lim y(t)=infinity as t--> t-

$4034.40

the perimeter of the field is the sum of the lengths of the four sides:

47 yd + 158 yd + 47 yd + 158 yd = 410 yd

the cost of 3 ft (1 yd) of fence is 3×$3.28 = $9.84.

so the cost of jake's wood perimeter fance is

(410 yd) × ($9.84 /yd) = $4034.40

8

step-by-step explanation:

option (a)

step-by-step explanation:

step 1:   take 2 number whose product equal to 25..

and sum of those two number are -10

step: 2 for example here if we take 5,5 are the number,,

5*5=25

and

5+5=10

but we need -10

so if we take   -5,-5

so -5*-5=25

and -5+(-5)=-10

s0

come the equation

replace -10x by these number

like -5x -5x+25

take common

x(x-5)-5(x-5)=0

(x-5)(x-5)=0

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