Traingular numbers can be modeled by a function suggested in the diagram. if you duplicate each triangular number on top of itself, you can partition the resulting arrangement into an n by square and a 1 by n now. Graph the function f(n)=1/2(n^2+n) and y=91 to determine which triangular number 91 is. Use your graph to communicate why any intersection points may be a solution to the equation, but now a reasonable solution to the problem.

n =13

Step-by-step explanation:

Solve for [ n(n+1) ]/2 = 91

=> n^2 +n -182 = 0

=> (n-13)(n+14)=0

=> n=13 ( n = -14 is not valid)

(13,91)

Step-by-step explanation:

f(n) = ½(n² + n) = 91

n² + n = 182

n² + n - 182 = 0

n² + 14n - 13n - 182 = 0

n(n + 14) - 13(n + 14) = 0

(n - 13)(n + 14) = 0

n = 13, -14(not possible)

n = 13

answer: the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.

step-by-step explanation:

the given rate of interest i= 85%

in calculating the monthly payment for a loan with an interest rate compounded monthly, the value of the interest rate per period we use in the formula must be in decimal form.

to convert it in decimal, we divide it by 100, we get

hence, the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.

stop cheating

step-by-step explanation: