No The people in a football game would not be a random sample from the school
Answer:
a) 38"
b) L = 5.7'
Step-by-step explanation:
a) Given
P = 9,500 lb/ft
Thick = 18"
We assume an allowable bearing pressure of σ = 3000 lb/sf
If Stress = Force / Area
σ = P/A
Solving for area
A = P/σ ⇒ A = 9,500 lb/ft/3000 lb/sf
⇒ A = 3.167 sf, or 3.167 ft wide, per foot of length.
⇒ A = 38" wide
We can see the pic 1 in order to understand the answer.
b) Given
P = 65,000 pounds = 65,000 lb
Thick = 18" = 1.5'
We assume an allowable bearing pressure of σ = 2000 lb/sf
If Stress = Force / Area
σ = P/A
Solving for area
A = P/σ ⇒ A = 65,000 lb/2000 lb/sf
⇒ A = 32.5 sf
then A = L² ⇒ L = √A = √(32.5 sf) = 5.7 ft
Finally L = 5.7'
We can see the pic 2 in order to understand the answer.
Answer:




Step-by-step explanation:
We can rewrite the given functions in the form
to determine the rate of growth or
to determine the rate of decay




Answer:
13t^2 +17
Step-by-step explanation:
It helps to regroup the terms so like terms are together. Then you can more easily see how to combine them.
(7t^2 +9) + (6t^2 +8) = 7t^2 + 9 + 6t^2 + 8
= 7t^2 + 6t^2 + 9 + 8
= t^2·(7 + 6) + (9 +8)
= 13t^2 +17
An earthquake with a rating of 3.8 can cause destruction in areas of up to 100 kilometers that are populated.
<span>R = log x </span>
<span>R = rating of the earthquake's size on the Richter scale </span>
<span>x = ratio of earthquake intensity to a minimum level of intensity</span>