If 14 g of a radioactive substance are present initially and 3 years later only 7 g remain, how much of the substance will be present after 7 yr?

answer: 12x^2+6x

step-by-step explanation:

6x does not equal 24x. hope it works!

median = 4

step-by-step explanation:

we are given a histogram which shows a data distribution. given that all class widths are 1, we are to find the median of this data distribution.

in any data set or distribution, median is its middle value such that the data is sorted out in an ascending order.

so here, we have 7 values and the middle value will be 4 as it separates the higher half from the lower half of the date distribution.

median = = 4

this is a geometric sequence with common ratio r

r = = = = 3

(a)

to obtain a term in the sequence multiply the previous term by 3

= 3 ← recursive rule

(b)

the n th term of a geometric sequence is

=

where is the first term and r the common ratio

= 6 × ← explicit rule

a)  

step-by-step explanation:

we have to remove the roots and then apply exponential formula.

given,

we know,

so, we get

hence the answer is-