Please help 1. rubidium has two isotopes, 72.2% rubidium-85, and 27.8% rubidium-87. Calculate the average atomic mass of rubidium. 2. Bromine also has two isotopes: 50.7% is bromine-79 and 49.3% is bromine-81. Can you estimate the average atomic mass of bromine without using a calculator? 3. What is the average atomic mass of fluorine, whose only naturally occurring isotopes has an atomic mass of 19?

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step-by-step explanation:

answer: approximately 206 bones

i hope this u out a branlist and a would be greatly appreciated :

6,250

step-by-step explanation:

to get the area, multiply 360 by 160.(57,600)

to find out how many bags of fertilizer it will take, first figure out how many square feet one bag can hold. divide 1000 by 8(125) to get the unit rate(how many square feet one pound of fertilizer can hold)and multiply it by 50(6250). if i haven't made a mistake, that is the answer.

answer: x=60