Acertain transverse wave is described by the equation
y(x, t)= ( 7.00 mm)sin2π(t0.0360s−x0.280m).
part a
determine this wave's amplitude
determine the waves frequency.
determine the wave's wavelength
determine the direction of propagation
determine the wave's speed of propagation

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

the answer is 3.1 his answer is wrong mines is right

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.