suppose x varies directly as and inversely as what will happen if y is halved and z is doubled, what hapened to x

What is sin 7x/4 ? i need on this urgent trig

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?

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?