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Zepler [3.9K]
3 years ago
15

Law of cosines please show your work :) Will mark as brainlest

Mathematics
1 answer:
Effectus [21]3 years ago
4 0

Answer:

33.9

Step-by-step explanation:

cos rule:

a²=b²+c²-2xaxbxcosA

rearrange:

cosA=(b²+c²-a²)÷(2xaxb)

solve:

cosx=(8²+22²-16²)÷(2x8x22)

cosx=(64+484-256)÷352

cosx=292÷352

cosx=0.830

cos^-1(shift cos)=33.9

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If 2x – 1 is a factor of 16x4<br> 24x3 + 2x + f, find f.
Nastasia [14]

Answer:

f = -5

Step-by-step explanation:

If 2x – 1 is a factor of 16x4 + 24x3 + 2x + f, find f.

If 2x - 1 = 16x⁴ + 24x³ + 2x + f, find f.

2x - 1 = 0

2x = 1

x = 1/2

Hence

f(1/2) = 16(1/2)⁴ + 24(1/2)³ + 2(1/2) + f

= 16(1/16) + 24(1/8) + 1 + f

= 1 + 3 + 1 + f

= 5+ f

f = -5

7 0
3 years ago
URGENT NEED HELP
Sergeeva-Olga [200]
5/50 or 1/10 in winning a prize.
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3 years ago
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Find the perimeter of a rectangle with a length of 6x+3 and a width of -2x-5.
blsea [12.9K]
The simple way of calculating a perimeter is to add all of the sides.
For a rectangle this would equal 2 x length + 2 x width
P = 2(6x + 3) + 2(-2x - 5)
= 12x + 6 - 4x - 10
= 8x - 4

At a higher level both the length and width must be greater than zero (= zero is a trivial rectangle)
6x + 3 > 0
6x > -3
x > -0.5

-2x - 5 > 0
2x + 5 < 0 (multiplying by -1 reverses the inequality)
2x < -5
x < -2.5

This rectangle cannot exist as x cannot be < -2.5 and > -0.5 at the same time!
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3 years ago
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Sammy is conducting a science experiment were he has to mix 8. 25 ounces and 4
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4 years ago
At the movie theater child admission is $5.20 and adult admission is $9.90.. On Friday 163 tickets were sold for a total sales o
Jet001 [13]

The number of tickets sold on Friday were 66 children tickets and 97 adult tickets.

<h3>What is an equation?</h3>

An equation is an expression that shows the relationship between two or more numbers and variables.

Let x represent the number of children and y represent the number of adult, hence:

5.2x + 9.9y = 1303.5     (1)

Also:

x + y = 163    (2)

From both equations:

x = 66, y = 97

The number of tickets sold on Friday were 66 children tickets and 97 adult tickets.

Find out more on equation at: brainly.com/question/2972832

#SPJ1

7 0
2 years ago
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