Why doesn't matter what letter or symbol is used to find an unknown number

How do i find the estimate of 82 x 49?

the total hours allotted for writing and oral competition is 2 and 3 / 5 hours. the writing competition is allotted 1 and 5/6 hours. how many hours are allotted for the oral competition

Solve the substitution 4x-3y=5 Y=2x-3

Put the following in order for the most area in the tails of the distribution. (a) Standard Normal Distribution (b) Student's t-Distribution with 1515 degrees of freedom. (c) Student's t-Distribution with 2020 degrees of freedom.

An airline knows that on average the probability that a passenger wil not show up for a flight is 6%. if an airline is fully booked and holds 300 passengers how many seats are expected to be empty?

A circle's diameter is 22 inches. What is the circle's circumference

You grew 3.8 inches since last year. If you are 61.2 inches tall now, how tall were you a year ago? Write and solve an equation.

A square and rectangle have the same perimeter. The rectangle is 13 cm long and 7 cm wide What is the length of a side of the square

What do 20% off the regular price mean?

a box is 24cm by 15cm by 10cm. this box will packed with smaller boxes of paper clips which are 6cm by 3cm by 5cm. what is the largest number of boxes of paper clips that will fit in the bigger box?