The cost to mail a letter with the United States Postal Service is calculated by the weight of the letter in ounces and is given by

the equation c = 0.21(x - 1) +0.50. What does the value 0.50 most likely represent?

The cost, in dollars, to mail a one ounce letter

The cost, in dollars, to mail an additional ounce.

The average weight, in ounces, of a letter.

The total weight, in ounces, of a letter

the answer would be the first one which is the cost, in dollars, to mail a one ounce letter

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation: