Solve the problem.A stained glass window is composed of 20 triangular sections, each with sides 5, 8, and 7 in. Find the total area of the window (to the nearest square inch).
A. 4285 in.2
B. 346 in.2
C. 17 in.2
D. 110 in.2
Answer: B
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Solve the differential equation.
+ 4y = 0
A. y = C1 sin 2x + C2 cos 2x B. y = (C1 + C2x)e-2x C. y = (C1 + C2x)e2x D. y = C1 sin 2x + C2x cos 2x
Solve.The foundation for a cylindrical fountain is a cylinder with a diameter of 14 m and 4 m high. How many cubic m of concrete are needed to build the foundation? Use 3.14 as the approximate value of ?.
A. 615.44 m3 B. 1230.88 m3 C. 2461.76 m3 D. 351.68 m3
In order to determine the effectiveness of a new vaccine that is alleged to cure "math anxiety," a study was conducted. One thousand volunteer college students enrolled in math courses across the U.S. were chosen. The 1000 students were broken up into two groups. Those enrolled in calculus courses were given the real vaccine. The students in developmental (remedial) math courses were given a fake vaccine consisting of sugared water. None of the students knew whether they were being given the real or the fake vaccine, but the researcher conducting the study knew. At the end of the semester the students were given a test that measured their level of math anxiety. The students in the treatment group showed significantly lower levels of math anxiety than those in the control group. On the
basis of this experiment the vaccine was advertised as being highly effective in fighting math anxiety.The control group in this study consists of A. the students chosen from developmental math courses. B. the 1000 volunteer college students used for the study. C. the students chosen from calculus courses. D. This study has no control group because it used volunteers. E. none of these
Use the midpoint formula to make the requested estimation.The life expectancy for a person living in a certain country born in 1990 was 78.9 years and the life expectancy of a person born in 2012 was 84.3 years. Estimate the life expectancy of a person living in this country born in 2001.
A. 81.6 yr B. 82.95 yr C. 83.6 yr D. 80.25 yr