The form or appearance of matter is altered during a(n) change. * 5 points
1)chemical
2)physical
3)endothermic
4)exothermic
ps:science not math

11

step-by-step explanation:

32.50-7.50=25

225/25=11

answer: 486in^2

step-by-step explanation:

answer: 8 years

step-by-step explanation:

the explanation is that in 8 years the child will be 20 and in 8 years the father will be 40 and 20 is half of 40.

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: