STATISTICS: What was the sampling method: simple random, convenience, stratified, cluster, systematic, or voluntary, that was used in the 1998 MMR vaccine and autism study done by Andrew Wakefield?

Multiply −2x(6x^4−7x^2+x−5) express the answer in standard form. enter your answer in the box.

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?

At the "no mutants allowed" country farm, every sheep has 4 legs, every chicken has two legs, and all animals have only 1 head. asked to count how many sheep and chicken are in the fields, a farm boy reports back that there are 140 feet and 50 heads. how many sheep and chicken are there? there are sheep and chicken at the farm.