Aseed mixture contains ryegrass and bluegrass. if 40% of the mixture is ryegrass, was is the ratio of the ryegrass to bluegrass ?

I'll give brainliest if you answer right : )

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?