8. When designers make compromises during the engineering design process, the result is often: a. additional criteria b. more constraints c. increased efficiency d. a trade-off Has an: 9, Mock-ups and prototypes are different types of: a. psychological models Review later b. conceptual models oc. physical models d. mathematical models Review later 10. Mathematical modeling aids in technological design by simulating how: a. a solution should be designed b. a proposed system might behave 3 oc. physical models should be built d. designs should be used