Find the area.
a. 287.5 mm2
b. 425 mm2
c. 192.5 mm2
d. 137.5 mm2

Step-by-step explanation:

The area of a triangle is commonly described as one half times the base times the height.  A better way to describe it though might be  one half times the base times the length from the highest point to the base.  A bit more of a mouthful but it helps get rid of confusion in cases like this.

So, the distance from the base to the highest point is 25 mm and the base itself is 11 mm.  That 23 doesn't mean anything here and the 35 is the length of one of the sides, but not the base or the height, so it's not used.  Anyway, we have the values we need.

(1/2)11 * 25 = 137.5

step-by-step explanation:

it's is b

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.