What statement provides an example of designing a solution in the technological design process?
a. aerospace engineers need a lightweight material to build a jet.
b. engineers determine which features the material must-have.
c. engineers test a carbon-plastic compound in a wind tunnel.
d. the carbon-plastic compound is redesigned to save maximum energy.

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.

Which of the following best describes the delian problem?

Precalculus question, image attached.