A scientist poured 1.6 x 103 milliliters of water into a container that already had 2.8 x 104 milliliters of salt water and 9.4 x 103 milliliters of sugar water. How many milliliters of liquid were in the container?
A. 1.7 x 104 milliliters
B. 3.58 x 104 milliliters
C. 3.74 x 104 milliliters
D. 3.9 x 104 milliliters

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Helll ! 1,400 tons of wheat of two different varieties was delivered to the silo. when processing one variety, there was 2% of waste and 3% during the processing of the second variety of wheat. after the processing, the amount of remaining wheat was 1,364 tons. how many tons of each variety of wheat was delivered to the silo?