Given the following exponential function, identify whether the change represents
growth or decay, and determine the percentage rate of increase or decrease.
y= 250(1.904)

Step-by-step explanation:

The exponential function is of the standard form

where a is the initial value and b is the growth/decay rate.  The rule for growth is if the b value is greater than 1, it's growth; if the b value is less than 1 but greater than 0, it's decay.

The tricky thing about determining the rate of growth is to keep in mind that you are starting with 100% of whatever it is you have and then are adding a certain percent to that.  Our initial value is 250.  Say, 250 bacteria in a dish.  If this b value is 1.904, that means that we are starting with 100% of the 250 bacteria but are adding 90.4% more to it per hour or day or minute.  100% + 90.4% = 190.4%, which in decimal form is 1.904.  Our growth rate is 90.4%.

Long story short, if the value of b is greater than 1, move the decimal 2 places to the right to get the percentage.  Subtract 100% from that percentage and that difference is your percent increase (aka growth rate).

1.904, moving the decimal 2 places to the right gives you 190.4%

Subtract 100% from 190.4% to get 90.4%.  That's the easy way to find the growth rate.

75 tickets have been sold so far.

step-by-step explanation:

in this question it is clearly mentioned that 45 children's tickets have been sold and this number is 60% of the total tickets sold.

now let's assume the total number of tickets sold be x.

then 60% of x = 45

⇒

⇒ x(.6) = 45

by dividing with .6 on both the sides of the equation

⇒ x = 75

therefore 75 tickets have been sold so far.

the answer is d

step-by-step explanation: