I supppose the answer is F(X)=X²+4, you can use the vertex to confirm.
Answer:
7
Step-by-step explanation:
To solve this, we have to work backwards. If you divide something by 9, and it equals 5, to figure out the number, we need to multiply by 9. 5*9= 45. If four was taken away, we have to add it to 45, which is 49. If a number *7 is 49, then we have to divide by 7 to get the answer. 49/7=7
Answer: 
Step-by-step explanation:
Given: The sales of 10000 increased by 65% each year .
Let x be the number of years.
The rate of growth=65%= 0.65
The exponential growth function is given by

, where A is initial amount and r is the rate of growth in decimal.
Then the increase in the sales id given by :-

7) Certainly there is a typo in the statement, just see that the expression of item (ii) is different from that of item (i). Probably the correct expression is:

. With this consideration, we can continue.
(i) Let E the expression that we are analyzing:

Since (x-1)² is a perfect square, it is a positive number. So, E is a result of a sum of two positive numbers, 2(x-1)² and 3. Hence, E is a positive number, too.
(ii) Manipulating the expression:

So, it's the case when E=0. However, E is always a positive number. Then, there is no real number x that satisfies the expression.
8) Let E the expression that we want to calculate:

Multiplying by (2-1) in the both sides:

Repeating the process, we obtain:
0.4 because if it’s five or more, add one more. If it’s four or less, let it rest.