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Questions in Grade College

[Free] A system of three linear equations in three variables is consistent and independent. How many solutions to the system exist? A. none B. one C. three D. infinitely many

[Free] Select the correct answer. Which value is equivalent to 178 centimeters? A. 1.78 millimeters B. 17.8 millimeters C. 1.78 meters D. $1.78 \times 10^{-2}$ micrometers E. $1.78 \times 10^{-5}$ kilometers

[Free] Why is it important to have an emergency rescue plan at an excavation site? A. To increase work speed in the confined space B. To plan what to do before an accident C. To reduce project costs D. To document the different chemicals in use

[Free] Consider this function. [tex]f(x)=-3 x+3[/tex] Which graph represents the inverse of function [tex]f[/tex]?

[Free] If a rock is thrown vertically upward from the surface of Mars with velocity of [tex]$25 m / s$[/tex], its height (in meters) after [tex]$t$[/tex] seconds is [tex]$h=25 t-1.86 t^2$[/tex]. (a) What is the velocity (in [tex]$m / s$[/tex]) of the rock after 2 s? (b) What is the velocity (in [tex]$m / s$[/tex]) of the rock when its height is 70 m on its way up? On its way down? (Round your answers to two decimal places.)

[Free] The equation of a line is [tex]$y=5 x+1$[/tex]. What is the slope of the line? a. 5 b. 1 c. -5 d. -1

[Free] Let [tex]y(t)[/tex] be the mass (in mg) remaining after [tex]t[/tex] years. Then we know the following. [tex] \begin{aligned} y(t) & =y(0) e^{k t} \\ & = \\ & =\text { Enter an exact number. } \end{aligned} [/tex]

[Free] According to the table, during which interval did the average time spent on hold increase? A. week 1 to week 3 B. week 1 to week 4 C. week 4 to week 6 D. week 3 to week 5

[Free] Solve using the quadratic formula: $2 x^2-x-7=-2$

[Free] Multiply the monomials. $\left(\frac{2}{7} n m^2\right)\left(28 n m^3\right)=\square$