The definition is pretty simple:

So, we only have to sum the expressions:

15×1.06
=15.9
therefor it is $15.90
It is an acute triangle since all the sides are less than 90 degrees (it's also equilateral)
Working out the expression 7(3ˣ) is first to calculate the value of 3ˣ then multiply the answer to 7.
For example, let x = 2
Then 7(3ˣ) = 7(3²) = 7 × 9 = 63
With the same value of x = 2, calculating 21ˣ = 21² = 441, which isn't the same answer with the expression 7(3ˣ)
Answer: The answer is A
Step-by-step explanation: because 5x-30= -150 because I looked it up