Answer:
correct answer = 90%
Step-by-step explanation:
Let x be the percent of the question did she answer correctly.
Given:
An engineering student answered 81 questions correctly on a 90 question test.
Find the percent of the question did she answer correctly.
Solution:
Percentage formula is given below
% answer 
% answer 
% answer 
% answer 
% answer 
% answer 
correct answer = 90%
Therefore, she answered 90% correctly.
Answer:
L = 9.91 decibels.
Step-by-step explanation:
The loudness, L is inversely proportional to the square of the distance, d, from the source of the sound.
i.e L 
L = 
Where k is the constant of proportionality.
When d = 14 feet and L = 85 dB, then;
k = L x 
= 85 x 
= 16660
k = 16660
L = 
Thus, when d = 41 feet, then;
L = 
= 
= 9.91077
L = 9.91 dB
The loudness is 9.91 decibels.
Answer:
45.7%
Step-by-step explanation:
16/14*40%=45.7%
Since the triangles are similar, we can use ratios to find what x equals.
Ratios:
3x+8/4 = 25/5
The easiest way to solve ratios, in my opinion is to cross multiply.
3x+8*5 = 4*25. Simplify to get 15x + 40 = 100.
Subtract 40 on both sides. 15x = 60.
Divide 15 on both sides. x = 4.
Surface Area=2(4x3)+2(3x6)+2(6x4)
108 ft²
