Apipe is at least 21 feet long, and you want to cut it into three pieces. the second piece is to be twice as long as the first piece, and the third piece is to be 1 foot longer than the second piece. what is the minimum length of the first piece?

What situation is an example of an observational study

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.

Atemperature of 1.64◦f corresponds to answer in units of ◦c.