B, because it show the price of one thing. Unit rate is always supposed to be money, miles, etc. per ONE UNIT (like a jug, book, page)
Hope this helps. :)
Since it has a negative exponent, the equation
is showing exponential decay. The graph will decrease.
In order to find the percent of change, we need to review our exponent properties. The product property tells us that when we raise a power to a power, we multiply the exponents. This means we can view our exponent of -2x as the product of two exponents, -2 and x. This would look like
. We know that negative number exponents tell us to "flip" sides of the fraction, so that tells us that 4⁻² = 1/4² = 1/16. We can then rewrite our equation as
Exponential decay is in the form y = a(1-b)ˣ. From our equation, a = 1. We know that 1-b = 1/16; this means that b must be 15/16. Thus our percent of decrease would be 15/16 = 0.9375 = 93.75%.
Flow is given as, F = - 4 gallon per minute into small tank.
( Since, flow is negative )
Volume of oil in large tank, V = 600 gallons.
Now,
Volume of oil has been moved :
Therefore, 128 gallons of oil has been moved to small tank.
Hence, this is the required solution.
Answer:
3x+4=5
Step-by-step explanation:
3x+4=25
3x=21
x=7