Choose the sentence that might be found in a personal narrative that correctly uses both a gerund and an infinitive.
a. acting became my door to a world of adventure and excitement.
b. although i had participated in school plays since i was in first grade, my parents did not appreciate my acting.
c. if only they had realized that to act was the focus of my dreaming.
d. i knew i had to show them how i felt by saving all my money to attend drama camp.

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

In a system, when potential energy decreases, then entropy also decreases. true false

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.