21, Given: AC=FC, CB = CD Prove:

Mathematics

1 answer:

neonofarm [45]2 years ago

5 0

Answer:

in triangle ACD and BCE

AC = EC

angle ACD = angle ECB ( COMMON ANGLE).

CB = CD

BY side and side criteria

triangle ACD is congruent to triangle BCE

so angle a is congruent to angle E

hence, proved

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The list shows the value of five accessories that Mary purchased for her cell phone. 29, 15, 22, 52, 38 What is the mean absolut

o-na [289]

Answer:

11.04

Step-by-step explanation:

Given the data:

29, 15, 22, 52, 38

The mean absolute deviation :

Mean, m = Σx / n

n = sample size = 5

29 + 15 + 22 + 52 + 38 = 156

Mean = 156 / 5 = 31.2

Mean absolute deviation (MAD):

Σ|x - m| / n

(|29 - 31.2| + |15 - 31.2| + |22 - 31.2| + |52 - 31.2| + |38 - 31.2|) / 5

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3 years ago

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lesantik [10]

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3 years ago

Read 2 more answers

Please help with me with #6

emmainna [20.7K]

So you reversed the subtraction a bit; the equation you're gonna be solving is $3x^2+8x-7-(5x^2+2x-11)$ .

First step ya gonna do is to reverse the + and - symbols in the trinomial thats in the parentheses so your equation looks like $3x^2+8x-7-5x^2-2x+11$

Now just combine like terms and your answer should be $-2x^2+6x+4$