The cost to mail a one ounce letter was 39 cents and the cost to mail a two once letter was 63 cents. what is the ratio of the cost to mail a one ounce letter to the cost to mail a two ounce letter

Asilkworm winds its cocoon out of one long silk fiber. to make silk thread, 3 to 10 of these silk fibers are unwound from their cocoons and combined into aa single thread with a typical length of 300 yards. choose a reasonable number of silk fibers in a thread write an equation to find the total length of the silk fibersused in 300 yards of the thread

What is the value of r of the geometric series?

Solve the equation by completing the square. x^2+2x=17