Situation:

a 39 gram sample of a substance that's a by-product of fireworks has a k-value of 0.1024.

n = n0e -kt

n0 = initial mass (at time t = 0)

n = mass at time t

k = a positive constant that depends on the substance itself and on the units used to measure time

t = time, in days
find the substance's half-life, in days.

round your answer to the nearest tenth.

He expression 2(l + w) is used to calculate the perimeter of a rectangle, where l is length and w is width. if the length is fraction 2 over 3 unit and the width is fraction 1 over 3 unit, what is the perimeter of the rectangle in units? fraction 2 over 3 unit 1 unit 1fraction 2 over 3 units 2 units

Samantha is growing a garden in her back yard. she spend $90 setting up the garden bed and buying the proper garden supplies. in addition, each seed she plants cost $0.25. a. write the function f(x) that represents samantha's total cost on her garden. b. explain what x represents. c. explain what f(x) represents. d. if samantha plants 55 seeds, how much did she spend in total?

The triangles in the diagram are congruent. if mzf = 40°, mza = 80°, and mzg = 60°, what is mzb?