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Juli2301 [7.4K]
2 years ago
9

Plssss hellpppp i don't understand​

Mathematics
1 answer:
FromTheMoon [43]2 years ago
3 0
I got a hold on hood for the
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If red oak lumber weighs 63 pounds per cubic foot, how much does one cord of red oak weigh? (A cord is a measurement for bulk wo
dsp73

Answer: Option C. 8,064 pounds

Solution:

Unit weight: U=63 pounds/foot^3

Total Weight: W=?

W=U*V

Volume: V

Length: l=8 feet

Width: w=4 feet

Height: h=4 feet

V=l*w*h

Replacing the knwon values in the formula above:

V=(8 feet)*(4 feet)*(4 feet)

V=128 feet^3

Replacing in the formula of total Weight:

W=U*V

W=(63 pounds/foot^3)*(128 feet^3)

W=8,064 pounds

8 0
3 years ago
some psychologists believe that a genius should be defined as anyone having an IQ over 140. If IQ scores are normally distribute
denis23 [38]

Answer:

61,239,550

Step-by-step explanation:

We let the random variable X denote the IQ scores. This would imply that X is normal with a mean of 100 and standard deviation of 17. We proceed to determine the probability that an individual chosen at random from the population would be a genius, that is;

Pr( X>140)

The next step is to evaluate the z-score associated with the IQ score of 140 by standardizing the random variable X;

Pr(X>140)=Pr(Z>\frac{140-100}{17})=Pr(Z>2.3529)

The area to the right of 2.3529 will be the required probability. This area from the standard normal tables is 0.009314

From a population of 6,575,000,000 the number of geniuses would be;

6,575,000,000*0.009314 = 61,239,550

6 0
3 years ago
Read 2 more answers
The perimeter of a rectangle is 8x-6 units. of the width is x-4 units , what is the length, in units, of the rectangle
Fed [463]

Answer:

C

Step-by-step explanation:

Hope this helped! Please tell me if I'm wrong!

3 0
2 years ago
Sarah made $180 for 12 hours of work. At the same rate, how much would he make for 17 hours of work?
lisabon 2012 [21]

Answer:

1260

Step-by-step explanation:

180 x 2

8 0
3 years ago
Can I help someone with math
Rina8888 [55]

Answer:

please mark my answer brainliest

Step-by-step explanation:

can you tell me a subscript n =sin to the power theta +cosec to the power n theta...and a subscript 1 =2...then prove that a subscript n =2...

8 0
3 years ago
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