brianna wants to buy a digital camera for a photography class. one store offers the camera for $47 down and a payment plan of $20 per month. the payment plan for a second store is described by y = 15x + 77, where y is the total cost in dollars and x is the number of months. which camera is cheaper when the camera is paid off in 12 months? complete the explanation

Step-by-step explanation:

Plan for store 1,

y = 47 + 20x

Here y = cost of the camera

x = number of months to pay

Plan for store 2,

y = 15x + 77

If Brianna pays off the amount in 12 months,

So for x = 12 months,

For store 1,

y = 47 + (20×12)

y = $287

For store 2,

y = 15(12) + 77

y = 180 + 77

y = $257

The camera at the second store is cheaper when he camera is paid off in 12 months because the cost at the first store is $287 and cost at the second store is $257.

step-by-step explanation: so we look at the formula un = a + (n-1)d

un is the amount of seats

n is the nth term aka row number

a is the original sequence/row number

d is the difference between each term

so in this a=22 d=6 and n can remain as n because we are simply formjng a rule

lets put these in the equation

un=22+(n-1)(6)

this is your answer to part a

however

lets double check that this is correct, we'll try putting it into the second term

un=a+(n-1)d

u2=22+(2-1)(6)

u2=22+6

u2=28

as the question said the second row has 28 seats so now we know the formula we made is correct.

as for part b

un=a+(n-1)

its asking us to find a row with 100 seats.

remember un was the amount of seata so all we do is substitute this in.

un=100 a=22 d=6

un=a+(n-1)d

100=22+(n-1)(6)

so now we simplify to find n which is the row number.

100-22=22+(n-1)(6)-22

78=(n-1)(6)

78/6=(n-1)(6)/6

13=n-1

13+1=n-1+1

14=n

so now we know that in the 14th row there is 100 seats.

hope this and that you understood! its my first time using the app or anyone out on here : p its also me to revise so a bunch! ask more questions if you dont understand ☺

a long term investor

step-by-step explanation:

because he is a long term investor