(4.9 x 10-2) (9.80 x 102) in scientific notation

Aline passes through the two given points. is it vertical , horizontal , or neither ? (5, 2), (-5, -2)

Mary used 1/7 of a spool of ribbon to complete 4 projects. she used the same amount of ribbon on each project. how much ribbon did she use on each project?

What are the soultion(s) to the quadratic equation 40- x^2=0