Joonas buys a solar panel system for his house with an estimated annual yield of 4200 kWh, and pays for it with installation costs 6500 euros. Joonas lives south enough, so that the yield on the product system can be thought of as constant throughout the year. Joonas wants to reduce his electricity bill with an investment, which consists of a monthly fee of € 25 and electricity itself € 0.14 / kWh a) Mark the month since the system was installed with an x and form function S (x), which represents the savings in euros achieved by Joonas' investment. b) How much has Joonas saved in 3 years? c) Where to save the savings have amortized the purchase price of the system?

step-by-step explanation:

the multiplicative inverse of a fraction a/b is b/a. for the multiplicative inverse of a real number, divide 1 by the number. for example, the reciprocal of 5 is one fifth 1/5 or 0.2, and the reciprocal of 0.25 is 1 divided by 0.25, or 4.

3

step-by-step explanation:

1; 35 is the ratio

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.