It will take 8 seconds for all of the dominoes to fall over.
This will be an exponential function. To find the growth rate, we can write out the terms of the sequence that goes along with it: 10, 20, 40, ...
"Growth rate" is the same as percent of increase or decrease. We find the amount of increase and divide by the original amount: 20-10 = 10 increase; 10/10 = 1.
The exponential function is of the form
f(x) = a*(1+r)ˣ, where a is the initial value (10), r is the growth rate (1), and x is the number of time periods. Using the variables given to us in the problem along with this information, we have:

Divide both sides by 10:

We will use logarithms to solve this:
Answer: The correct answer is C,
5 1/2 feet
Step-by-step explanation:
Alexis' scale drawing represents the longest side of the storage bin as 2 3/4 inches. Converting to improper fraction, it becomes 11/4 inches. This is also 2.75 inches.
The scale used is 1/2 inch = 1 feet. This means that a length of 1 feet of the longest side of the actual storage bin is 1/2 inch on the drawing.
Let the actual length, in feet of the longest side of the storage bin be x feet. Therefore
If 0.5 inch = 1 feet
2.75 inch = x
0.5x = 2.75 × 1
x = 2.75/0.5 = 5.5 feet
Let x equal the cost of one muffin and y equal the cost of quart of milk
8x+2y=18
3x+y=7.50
See if you can solve it from there. If not let me know