Evaluate 3(a-4b) when a= -2 and b= 5
1 answer:
You might be interested in
Answer:
see explanation
Step-by-step explanation:
The exponential function is of the form
y = a
Substitute the given points into the equation to find a and b
Using (0, 4), then
4 = a ⇒ a = 4
Using (1, 24), then
24 = 4 ⇒ b = 6
Exponential function is
y = 4 ×
Answer:
A. T = 20°C - (2.8°C/h × 4h)
Step-by-step explanation:
The rate of change of temperature (-2.8°C/h) is multiplied by time (4h) to get the change in temperature (-11.2°C). That change is added to the initial temperature (20°C) to find the temperature after 4 hours.
Only equation A properly expresses this calculation.
In choice B, the rate of change is (wrongly) shown as +2.8°C/h. In the other choices, the combinations of units are nonsense. (What is a °C·h?)
