Anna is trying to save some money on her electric bill. her electric company has come up with a new plan designed to charge customers based on when they use electricity. she is trying to decide if the new interval use plan would be better than the standard use plan for her needs. calculate the monthly costs of both plans if she uses 1,185 kwh of electricity per month with 500 kwh on-peak usage and the rest off-peak usage. standard use plan 8.5 cents/kwh for the first 600 kwh 11 cents/kwh for anything over 600 kwh interval use plan on-peak hours - 16 cents/kwh off-peak hours - 4 cents/kwh a. standard use plan - $64.35; interval use plan - $80.00 b. standard use plan - $115.35; interval use plan - $107.40 c. standard use plan - $64.35; interval use plan - $107.40 d. standard use plan - $115.35; interval use plan - $80.00

parallel and congruent

step-by-step explanation:

the movement of translation is linear.   these have the same translation because you are using the same rule for each point of the triangle so you will see the same slope being used to get from a point on the triangle to its image.

same slope!   you should think parallel when you see those 2 word together (well unless it's the same line but it can't be because we are coming from different points here)

congruent! because each point is being moved the same distance.

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 ☺