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kirill [66]
3 years ago
8

Jerry went the store to buy cat food, but when he got there, the brand name

Mathematics
1 answer:
GenaCL600 [577]3 years ago
7 0

Answer:

the regular cat food costs $2.95

the wheat cat food costs $3.45

Step-by-step explanation:

so what i did was use the elimination method by setting up 2 equations r is for regular food and w is for wheat food

3r-2w=1.95

2r+2w=12.80

the way this method works is simply combining like terms into one equation

if you notice, the wheat food cancels out so we end up with

5r=14.75

then dividing 14.75 by 5 gets you r

r=2.95

you then plug in r back into one of the equations from before

2(2.95)+2w=12.8

then you solve for w

5.9+2w=12.8

2w=6.9

w=6.9/2

w=3.45

r=2.95

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Answer:  b) 84

Step-by-step explanation:

Let p be the prior estimate of the required proportion.

As per given , we have

p =0.5   (The probability of getting heads on a fair coin is 0.5)

Significance level : \alpha: 1-0.90=0.10\\

Critical z-value (using z-value table ) : z_{\alpha/2}=1.645

Confidence interval width : w= 0.18

Thus , the margin of error : E=\dfrac{w}{2}=0.09

Formula to find the sample size ( if prior estimate of proportion is known.):-

n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2

Substitute the values , we get

n=0.5(1-0.5)(\dfrac{1.645}{0.09})^2

Simplify ,

n=83.5192901235\approx84  [Round of to the next whole number.]

Hence, the number of times we would have to flip the coin =<u>84</u>

hence, the correct answer is b) 84

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3 years ago
0.817 times 1.5 must show answer
Gnesinka [82]

Answer:

(0.817)(1.5)

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Step-by-step explanation:

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Determine the value of the variable from the image below.
GuDViN [60]

Answer:

<h2>x=29</h2>

Step-by-step explanation:

<h3>to understand the solving steps</h3><h3>you need to know about:</h3>
  • right angle
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<h3>to solve:</h3><h3>x</h3><h3>let's solve:</h3>

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according to the question

x+3+x-1+x+1=90

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2 years ago
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2 years ago
Expand the following:<br> a) x(x + 2)<br> b) x(2x - 5)<br> c) 2x(3x + 4)<br> d) 6x(x - 2)
TEA [102]

Answer:

<h2>a. \:  {x}^{2}  + 2</h2>

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solution,

a. \: x(x + 2) \\  \:  \:  = x \times x + 2 \times x \\  \:  \:  =  {x}^{2}  + 2x

b . \: x(2x - 5) \\  \:  = x \times 2x - x \times 5 \\  \:  \:  = 2 {x}^{2}  - 5x

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d. \: 6x(x - 2) \\  \:  \:  = 6x \times x  - 6x \times 2 \\  \:  \:  = 6 {x}^{2}  - 12x

<h2> </h2><h2 />

Hope this helps...

Good luck on your assignment..

4 0
3 years ago
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