A laboratory has a 75-gram sample of radioactive material. The half-life of the material is 10 days. (This means that it
takes 10 days for half of the initial mass to decay.)
The formula below can be used to find m, the remaining
mass in grams, in terms of t, the number of 10-day intervals
the mass has been decaying.
75(0.5)^t
Based on the formula, what is the mass of the laboratory's
sample remaining after 30 days?

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47

a

b

d

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