The formula for any arithmetic sequence is a n = a 1 + d(n - 1), where a n represents the value of the nth term, a 1 represents the value of the first term, d represents the common difference, and n represents the term number. what is the formula for the arithmetic sequence -7, -3, 1, 5, an = 5 + 4(n - 1) an = 4 + (-7)(n - 1) an = -7 + 4(n - 1) an = -7 + 5(n - 1)

a1 = - 7

d = 4

an = - 7 + 4(n - 1)

Try a4

a4 = - 7 + 4(4 - 1)

a4 = -7  + 4*3

a4 = -7 + 12

a4 = 5 which it does.

i think it is 70

step-by-step explanation:

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.