The length of a side of a square is given by the expression 3x - 1 and its perimeter is 20 cm. Write and solve an equation to find the value of x. Which of the following
have both the correct equation and side length of the square?
A. 4(3x - 1) = 20; side length = 4.25 cm
B. (4 x 3x) - (4 x 1) = 20; side length = 5 cm
C. 12x - 1 = 20; side length = 1.75 cm
D. 4(3x - 1) = 20; side length = 2 cm

its 69.420

step-by-step explanation:

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

if you are looking for the unit rate then the answer would be 9 because unit rate is distance divided by time.

step-by-step explanation: