Tom earns $40 a week mowing lawns. He spends 1/10 of his earnings on lunch and 4/5 of his earnings on music. He saves the rest. How many dollars does Tom save?

$4

Step-by-step explanation:

Tom earns $40 a week when he now lawns.

Amount earned by Tom= $40

Fraction spent on lunch= 1/10

Fraction spent on music= 4/5

Fraction saved= 1-(1/10 + 4/5)

= 1-(1/10+8/10)

=1-(9/10)

=1/10

Amount saved = 1/10 × 40

= $4

Tom saves $4 out of the weekly amount he means by mowing lawns.

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.

b. 6

step-by-step explanation:

we are given the table representing an exponential function.

we can see from the table that, as x is increasing, the value of y is increasing in the power of 6.

i.e. the following relation is obtained,

x = 1, y = 6

x = 2, y = 36 =

x = 3, y = 216 =

x = 4, y = 1296 =

x = 5, y = 7776 =

so, the geometric series obtained is .

thus, the common ratio is given by = = 6.

hence, the common ratio is 6.