It about math and I not good at it so I need help and it about adding division subtract multiplication word problems

Divide. reduce the answer to lowest terms.5 2/3 ÷ 3 1/9

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.