Dawn is y years old. Rashid is three times as old as Dawn.
Hugo is seven years younger than Dawn.
The total of Dawn's age, Rashid's age and Hugo's age is T years.
a) Find a formula for T in terms of y.
(3)
b) Which row from the table shows an identity?
B
<OOW
C = D.
4a + 3 = 23
X-5 > 9
C + 6d - 3e
9n + 3n = 12n
(1)
Total marks. 4​

answer:

c. the third graph

answer: b

step-by-step explanation:

40 i don’t know lololol

ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

source: