The diagram below shows the arrangement of seats in the first three rows of an auditorium.

if this pattern continues throughout the auditorium, how many seats will be in the 21st row?

a.84

b.82

c.86

d.90

the rows are under the answers for this question in order to answer it.

The table above shows approximate conversions from gallons to liters. what is the value of x?

Idont understand math at all! : o( use this scenario to answer the remaining questions: brenton purchased a new bedroom set for $4,500.00. he lives in arizona and pays a 8.75% sales tax. if he made a 50% down payment and financed the rest, what amount did he finance? what is the total sales tax brenton will pay? enter your answer in currency format, round to the nearest cent. what was brenton's total amount financed? enter your answer in currency format, round to the nearest cent.

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.