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pickupchik [31]
3 years ago
7

Explain how you would factor 9x^2 – 49 show your work and use complete sentences. what is this special type of factoring called?

Mathematics
1 answer:
tatuchka [14]3 years ago
3 0
9x² - 49

(3x)² - (7)²

= (3x + 7)(3x - 7)

This type of factoring is called Difference of Two Squares

where x² - y² = (x + y)(x - y)
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What is 22 pt =______ qt
Dahasolnce [82]

Answer:

13.2104

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3 years ago
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Solve each system by graphing:<br> Y= 1/4x-4 <br> Y= -x+1
AlexFokin [52]
Do you have a graphing calculator?  if yes than all you have to do is hit the y= button in the top left corner and type 1/4x-4 for y1. then you need to hit graph in the top right corner.  repeat this process substituting 1/4x-4 and -x+1
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3 years ago
Find the measures of ∠B and ∠C. PLEASE HELP!!
BartSMP [9]

It's an isosceles triangle, therefore m∠B = m∠C.

We have the equation:

2x + 10 = 3x - 5      <em>subtract 10 from both sides</em>

2x = 3x - 15     <em>subtract 3x from both sides</em>

-x = -15     <em>change the signs</em>

x = 15

m∠B = (2x + 10)°

m∠B = (2 · 15 + 10)° = (30 + 10)° = 40°

We know, the sum of measures of a tringle is equal 180°.

m∠A + m∠B + m∠C = 180°

m∠B = m∠C = 40°

<h3>Answer: ∠B = 40° and ∠C = 40°</h3>
8 0
3 years ago
An acute triangle has side lengths 21 cm, x cm, and 2x cm. if 21 is one of the shorter sides of the triangle, what is the greate
madam [21]

Given that the sides of the acute triangle are as follows:
21 cm
x cm
2x cm

Stated that 21 cm is one of the shorter sides of the triangle2x is greater than x, so it follows that 2x MUST be the longest side


For acute triangles, the longest side must be less than the sum of the 2 shorter sides
Therefore, 2x < x + 21cm
2x – x < 21cm
x < 21cm

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8 0
3 years ago
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Suppose that the hourly wages of fast food workers are normally distributed with an unknown mean and standard deviation. The wag
Nutka1998 [239]

Answer: 1.303639

Step-by-step explanation:

The t-score for a level of confidence (1-\alpha) is given by :_

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Given : Level of significance : 1-\alpha:0.80

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Sample size : n=40

Then , the degree of freedom for t-distribution: df=n-1=40-1=39

Using the normal t-distribution table, we have

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Thus, the t-score should be used to find the 80% confidence interval for the population mean =1.303639

8 0
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