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Mathematics

1 answer:

ira [324]3 years ago

4 0

Answer: 3/4

Step-by-step explanation:

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Use the Law of Cosines to determine the indicated side x. (Assume a = b = 20. Round your answer to one decimal place.)

zhuklara [117]

Answer:

37.6

Step-by-step explanation:

x² = a² + b² - 2ab cos 140°

x² = 20² + 20² - 2(20)(20)(-0.766)

x² = 400 + 400 - 800(-0,766)

x² = 800 - (-612.835)

x² = 800 + 612.835

x² = 1412.835

x =√1412.835 = 37.6

4 0

3 years ago

Find volume and surface area

Nadya [2.5K]

This is a right solid meaning that the area of the base doesn't change at all as you go up the shape. To find the volume of a right solid, multiply the area of the base times the height.

height      area of base                                                  Volume
    v                  v                                                                v
    7 x (4 x 2 + 3 x 2 + 3 x 2) = 7 x (8 + 6 + 6) = 7 x 20 = 140 cm^3

To find aurface area we must add together the areas of the two bases, which we learned were 20 as well as the back of the shape and the other three faces facing towards us.

bases        back                     faces
     v               v
(20 x 2) + (10 x 7) + (4 x 7) + (3 x 7) + (3 x 7) = 40 + 70 +28 + 21 + 21

Add these together to find your surface area of 180 cm^2

7 0

3 years ago

NEED HELP WILL GIVE BRAINLIST WILL REPORT FAKE ANSWERS

emmainna [20.7K]

Answer:

1. Allans brother is 19

2. $18.75

Step-by-step explanation:

1. 11 x 2= 22 - 3= 19

2. $1.05 x 15= $15.75

$15.75 + $3 = $18.75

3 0