Answer:
z=(At-67)/(45-A)
Step-by-step explanation:
A(t+z)=45z+67
At+Az=45z+67
At=45z-Az+67
At=z(45-A)+67
z(45-A)=At-67
z=(At-67)/(45-A)
Answer: C
Step-by-step explanation:
The Number Of pen in a package.
Answer:
20. y = 3·3^x
21. y = (1/3)^x
Step-by-step explanation:
These exponential functions can be written in the form ...
y = a·b^x
where a is the value of y when x=0, and b is the common ratio between terms that have x different by 1.
__
20. The ratio is 9/3 = 3; the multiplier is 3 (the value of y when x=0), so the function is ...
y = 3·3^x
__
21. The ratio is (1/3)/1 = 1/3; the multiplier is 1, so the function is ...
y = (1/3)^x
_____
<em>Alternate solution</em>
Each of these can be written in a more compact form:
20: y = 3^(x+1)
21: y = 3^(-x)
