Use regression to solve the problem. Round numbers to the nearest hundredth.The first column shows the independent variable (x). The second column shows the dependent variable (y).
Find the quadratic regression model.
A. y = -0.03x2 - 7.80x + 94.60
B. y = -0.04x2 - 7.80x + 92.60
C. y = -0.03x2 - 8.80x + 92.60
D. y = -0.04x2 - 8.80x + 94.60
Answer: D
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Determine the principal value without using a calculator.- 4
A. -5 B. Not real number C. 25 D. 8.368
Add or subtract and write answer in lowest terms.
- 
A. 
B. 
C. 
D. 
240 V/10 kohms =
a. 2.4 A b. 0.24 A c. 24 mA d. 2.4 microamps e. 240 nA
Solve the problem.Use the formula N = Iekt, where N is the number of items in terms of the initial population I, at time t, and k is the growth constant equal to the percent of growth per unit of time. A certain radioactive isotope has a half-life of approximately 1500 years. How many years would be required for a given amount of this isotope to decay to 25% of that amount?
A. 3000 years B. 2975 years C. 623 years D. 1125 years