Use benchmarks to estimate the sum. 11/15 + 1/8 a about1/2 b about3/4 c about1 d about1 1/2

b) 1/3 * 1/5

step-by-step explanation:

each smallest part is 1/15 since the written one is 1/5 and it's divided by 3 equal parts. (1/5 )/3 = 1/15 = 1/3 * 1/5

a long term investor

step-by-step explanation:

because he is a long term investor

y=-2x+1500

step-by-step explanation:

+1500

2 over one

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: