Someone please help no link

The parabola opens: y=√x-4 (principal square root) up down right left

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.