I need help please ! If anyone could give me the correct answers I’ll give 5 stars

What is the number 321,000,000 in scientific notation? also what is the number? ?

What would the rule be for the reflection of y=-3

The table below shows the approximate height of an object x seconds after the object was dropped. the function h(x)= -16x^2 +100 models the data in the table. for which value of x would this model make it the least sense to use? a. -2.75 b. 0.25 c. 1.75 d. 2.25