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hichkok12 [17]
3 years ago
12

To discourage guessing on the multiple-choice exam a professor assigned 4 points for a correct answer, -4 points for an incorrec

t answer, and -1 for leaving the question blank. what is the score for a student who had 15 correct answers, had 5 incorrect answers, and left 5 questions Blank?
Mathematics
2 answers:
Zanzabum3 years ago
8 0

Answer:

35

Step-by-step explanation:

4 x 15 = 60

-4 x 5 = - 20

-1 x 5 = -5

60 - 20 - 5 = 35

ki77a [65]3 years ago
7 0

Answer:

The Student would make a 45.

Step-by-step explanation:

So, 1st, you multiply 15x4, that would = 60. so then you would multiply 5x4, that would equal 20. So, you will subtract 20 from 60, and you will get 40. 5x1=5, so then you will add 5+40, and get 45!!

Hope this helps!!! (:

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Hello! How do I find the surface area of this prism? Thanks!
Studentka2010 [4]
Answer: Choice C) 124 square cm

------------------------------------------------------------------

Explanation:

Let's calculate the area of the trapezoid shown
b1 and b2 are the parallel bases; h is the height of the 2D trapezoid
b1 = 2
b2 = 5
h = 1.5

A = h*(b1+b2)/2
A = 1.5*(2+5)/2
A = 1.5*7/2
A = 10.5/2
A = 5.25
The area of one 2D trapezoid is 5.25 sq cm
There are two of these trapezoids that form the base faces of the trapezoidal prism. So the total base area is 2*5.25 = 10.5 sq cm
Keep this value (10.5) in mind. We'll use it later.

------------

Now onto the lateral surface area (LSA)
It turns out that the formula for the LSA is
LSA = p*d
where 
p = perimeter of the trapezoid shown
d = depth or height of the 3D trapezoid (I'm not using h as it was used earlier)
This formula works for any polygonal base. It doesn't have to be a trapezoid.

In this case the perimeter is,
p = 1.7+2+2.65+5
p = 11.35

So
LSA = p*d
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LSA = 113.5

Add this LSA to the base area found earlier
10.5+113.5 = 124

The total surface area is 124 square cm
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4 years ago
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