Option B:
Solution:
Given sound level = 120 decibel
To find the intensity of a fire alarm:
where
Step 1: First divide the decibel level by 10.
120 ÷ 10 = 12
Step 2: Use that value in the exponent of the ratio with base 10.
Step 3: Use that power of twelve to find the intensity in Watts per square meter.
Now, do the cross multiplication,
Option B is the correct answer.
Hence .
Answer:
a. Let the variable be for the fundraising activities and
as the revenue for foundation.
b.
c. $43.2
d. $1416.67
Step-by-step explanation:
Given that:
The World Issues club donates 60% of the total of their fundraising activities.
Answer a.
Let us choose the variable to represent the money earned during fundraising activities and
for the revenue generated for foundation.
Answer b.
Foundation will receive 60% of the total of the fundraising activities.
Equation to determine the money that will be received by foundation:
Answer c.
Given that x = $72, M = ?
Putting the value of x in the equation above:
Answer d.
Given that M = $850, x = ?
Putting the value of M in the equation above to find x:
So, the answers are:
a. Let the variable be for the fundraising activities and
as the revenue for foundation.
b.
c. $43.2
d. $1416.67