A student can do an average of 25 math problems an hour. If at a certain time of day, he has done 40 math problems, how many problems will he have done if he continues working for another 2 hours?
__ math problems

90

Step-by-step explanation:

now: 40

after one hour: 40+25 = 65

after two hours: 65+25 = 90

answer: -8.2562234e+13

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.