Final answer:
The equation v = (7)(-3) is solved by multiplying the two numbers to get v = -21. For complex problems involving kinematics or chemistry, specific known values are substituted into the appropriate formulas to find the unknown variables.
Step-by-step explanation:
To solve the equation v = (7)(-3), we simply perform the multiplication of the two numbers. Multiplying 7 by -3 gives us the result v = -21. This is a straightforward arithmetic operation commonly encountered in high school mathematics.
In more complex scenarios, like finding the displacement Ax, or x - x0, we would identify the known values, such as initial velocity (v0), final velocity (v), and acceleration (a). Using an appropriate kinematic equation, such as v2 = v02 + 2a(x - x0), we would substitute the known values to find the unknown variable. For example, if v0 = 30.0 m/s, v = 0, and a = -7.00 m/s2, we could determine the displacement.
In determining the hydronium ion concentration from a given pH, such as pH = -1.07, we would use the inverse logarithmic operation, calculating 10-pH using a scientific calculator to get the concentration in moles per liter.