Use scientific notation to solve the problem.If you could generate energy by fusing the hydrogen in ordinary tap water, how much water would you need to meet the energy needs of the United States for 56 years? Assume that the energy released by fusion of hydrogen in one liter of water is 7 × 1013 joules and that the U.S. annual energy consumption is 1 × 1020 joules. Give your answer in scientific notation.
A. 1.4 × 107 liters
B. 8 × 101.5 liters
C. 8 × 107 liters
D. 8 × 10-7 liters
Answer: C
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Solve the problem.Consider the following simplified digital photograph that has a 3 × 3 grid with four gray levels numbered from 0 to 3. It shows a letter Y in dark gray on a white background.
Let A be the 3 × 3 matrix that represents this figure digitally. Find the matrix B such that A + B will represent the entire picture becoming one gray level darker.
A. 
B. 
C. 
D. 
Write 100110 2 in decimal form.
What will be an ideal response?
Solve the problem.A rumor spreads through a community of 800 people at the rate 
= 0.1(800 - N)N1/2where N is the number of people who have heard the rumor at time t (in hours). Use Euler's method with h = 0.5 to find the number who have heard the rumor after 1.5 hours, if 1 person heard it initially.
A. about 711 people B. about 681 people C. about 702 people D. about 719 people
Calculate.-10 - 41
A. 51 B. 31 C. -31 D. -51