Amath teacher gives her class two tests. 70% of the class passed both tests and 80% of the class passed the first test. what percent of those who passed the first test also passed the second test?

87.5% of those who passed the first test also passed the second test.

Lets assume, the total number of students in the class = X

As 80% of the class passed the first test, so the number of students passed the first test = 80% of X

and the number of students passed both tests

= 70% of X

It means, this 0.7X of those who passed the first test also passed the second test.

So, the percentage of 0.7X in respect of 0.8X is :

Thus, 87.5% of those who passed the first test also passed the second test.

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.