Sebuah zat radioaktif meluruh menjadi setengahnya dalam waktu 2 jam. Jika pada pukul 06.00 massa zat tersebut 1.600 gram, hitunglah massa zat yang tersisa pada pukul 14.00. ( Geometric sequence = barisan geometri) ?

i'm sorry mate, but i am not seeing any figures. i am unable to solve this for you.

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

step-by-step explanation:

well if you round, things become much more simple. round 5.95 to 6, 4.25 to 4, and 1.05 to 1. now, add 6+4+1 and that would equal 11. so the items together would equal to about $11.

step-by-step explanation:

what does 'mandy have ben 780 bottle caps. ' mean?