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Angelina_Jolie [31]
3 years ago
15

How you can use mental math to find the product

Mathematics
1 answer:
amid [387]3 years ago
3 0

The answer would be 2431.

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PLEASE SOMEONE TELL ME HOW THEY GOT 423 cm AS THE ANSWER FOR A. I NEED HELP WITH THIS QUESTION!!!!!!!!!!!!!
3241004551 [841]

From the setup of the problem, the "length of the top of the bookcase, measured along the attic ceiling" will be the hypotenuse of a right triangle, the length "AB". We have both the angle between AB and AC and the length of AC (3.24 meters), so we can use trigonometric identities.

The cosine of the 40 degree angle between AB and AC is equivalent to the length of AC divided by the length of AB. Equivalently, we have:

cos(40) = \frac{3.24}{h}

where "h", the hypotenuse, is the length we want. Rearranging the formula to solve for h we have that

$h = \frac{3.24}{cos(40)}$

which is 4.2295... meters. Converting to centimeters (multiplying by 100) we have that h = 422.95... centimeters, or if we round the value, h = 423 centimeters.

6 0
2 years ago
Who won the Superbowl in 1996
Sophie [7]

The Dallas Cowboys.

7 0
2 years ago
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Josie found a small bird bath at a garage sale. The bird bath has a circular opening with a radius of 10 cm, as shown in the dia
sveticcg [70]

Answer: 1256cm

Step-by-step explanation:

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3 years ago
WILL MARK BRAINLIEST AND EXTRA POINTS ONLY HAVE 5 MINS
adelina 88 [10]

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1/3?

Step-by-step explanation:

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3 years ago
Simplify the given expression, using only positive exponents. then complete the statements that follow. [ (x2y3)−1 (x−2y2z)2 ] 2
PolarNik [594]
[(x**-2) y**2 .z)**2]**2        (x**-8)(y**8)(z**4)
----------------------- =        ----------------------------- 
[x**2 . y**3]**2                   (x**4) (y**6)


     (y**8)(z**4)            (y**2)*(z**4)
    --------------------- = -------------
    (x**12) (y**6)             (x**12)

7 0
3 years ago
Read 2 more answers
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