Easy algebra questions

rewrite x^2 + 6x - 4 in vertex form and identify the vertex.
(x-5)^2 - 3 ; (5, -3)
(x+5)^2 - 3; (5, -3)
(x+3)^2 + 5; (-3, 5)
(x-3)^2 + 5; (-3, 5)

what are the four ways to solve a quadratic equation? (choose four options below)
- graphing to identify the x-intercepts
- y = mx + b
- factoring and setting each factor equal to zero
- completing the square
- exponential functions
- the quadratic formula

suppose the initial height of the stone is 12 feet and the stone is being launched with a velocity of 61 feet per second. what is the maximum height of the stone after it's launched?
a. -3/16 feet
b. 4 feet
c. 70 feet
d. 11 feet

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.