Answer:
221,000,000,000,000,000,000 = 2.21 x 10^20
therefore, the answer is b
Step-by-step explanation:
Answer:
Combined equation is 
Step-by-step explanation:
a varies directly as b and inversely as c.
This can be written as
a =
a = kb
where k is the proportionality constant
-------------------------------------(1)
Now lets find the k value bu substituting the given a, b,c values


36 = 12 k

k = 3
Thus the eq(1) becomes

Let us now find the value of a when b=7 and c = 3


a = 7
Answer:
y= -2/3x+9
Step-by-step explanation:
slope int form is y=mx+b, so just take the given numbers and plug them into the equation.
Here’s my answers, for #10 it got cut off but I got m=9/7 and d=11.40