Find the length of the curve. r(t) = 7t, 3 cos(t), 3 sin(t) , −2 ≤ t ≤ 2

we are given

we can find x , y and z

now, we can use arc length formula

now, we can find derivative

now, we can plug values

and we get

...........Answer

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is: