A man wants to determine the height of a light house. He measured the angle at A and found that tan A = 3/4. What
is the height of the light house if A is 40 m from the base ?

step-by-step explanation:

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm