Call wireless phone company charges $0.50 for the first call you make and $0.10 for each additional minute. the cost of a phone call can be expressed by the formula c = 0.50 + 0.10(m – 1), where c is the total cost in dollars and m is the number of minutes that you talk. if the bill for your phone call was $1.90, how long did you talk? .

If the bill for your phone call was $1.90, we talked for 15 minutes. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

15 minutes

Step-by-step explanation:

Here the given function that shows the cost( in dollars ) of phone call after taking m minutes,

If the bill is $ 1.90,

That is, C = 1.90

From equation (1),

   ( Subtracting 0.50 on both sides ),

                 ( Dividing both sides by 0.10 ),

                    ( Adding 1 on both sides ),

Hence, 15 minutes were taken for talking.

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 ☺