Divide -20 by 5 to get -4.
Multiply -4 and -3 to get 12.
Multiply 4 and -2 to get -8.
Multiply -8 and -1 to get 8.
Add 12 and 8 to get 20.
Calculate 4 to the power of 2 and get 16.
Subtract 16 from 20 to get 4.
It will take her 5 5/8 hours to read 3/4 of the book
<h3>Ratio and proportions</h3>
Given that Elisabeth reads 1/5 of her book in 1 1/2 hours, this is expessed as:
0.2 of a book = 1.5 hours
In order to determine the time taken to read 0.75 part of the book, we will have:
0.75 of a book = x
Take the ratios
0.2/0.75 = 1.5/x
0.2x = 1.125
x = 1.125/0.2
x = 5.625
Hence it will take her 5 5/8 hours to read 3/4 of the book
Learn more on ratio and proportion here: brainly.com/question/19994681
Given:
Area of the trapezoid is 39 ft².
The image contains a measurement of 11 ft and 15 ft on its bases.
Area of a trapezoid = (a + b)/2 * h
39 ft² = (11ft + 15ft)/2 * h
39ft² = 26ft/2 * h
39ft² = 13ft * h
39ft² ÷ 13ft = h
3ft = h.
The height of the trapezoid is 3 feet.
For the first one I’m not sure, but for 2 it is B and 3 is 5.
