MATH HELP ME ASAP PLSSS

-5

an=4-5n

a12=-56

Step-by-step explanation:

a1=-1,an=a1+d(n-1)

a2=a1+d(2-1)=-1+d=-6

so    -1+d=-6

        +1      +1

          d=-6+1

           d=-5

an=a1+d*(n-1)  now I substitute a1 and d because I know them

an=-1+-5*(n-1)=-1-5n+5

an=4-5n

a12=a1+d*(12-1)

a12= -1 -5*11=-1-55

a12=-56

if a = 1,   and b = 2, then the answer is 47.99999999. if you round that to the nearest whole number, the answer is 48.

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)