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BigorU [14]
3 years ago
8

Juan builds a square dog pen that has an area of 100 square feet. He then builds a second pen that has an area of 49 square feet

. Which is the closest to the percent of the decrease in the area of the pen? *
IT IS NOT 221
Mathematics
2 answers:
Gekata [30.6K]3 years ago
7 0
51..............................................
EleoNora [17]3 years ago
4 0

Answer:

51%

Step-by-step explanation:

Simple. 100-49=51

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A trucking firm has a large inventory of spare parts that have been in storage for a long time. It knowsthat some proportion of
Debora [2.8K]

Answer:

0.1546\leq \widehat{p}\leq 0.3513

Step-by-step explanation:

The firm tests 75 parts, and finds that 0.25 of them are notusable

n = 75

x = 0.25 \times 75 = 18.75≈19

\widehat{p}=\frac{x}{n}

\widehat{p}=\frac{19}{75}

\widehat{p}=0.253

Confidence level = 95%

So, Z_\alpha at 95% = 1.96

Formula of confidence interval of one sample proportion:

=\widehat{p}-Z_\alpha \sqrt{\frac{\widehat{p}(1-\widehat{p}}{n}}\leq \widehat{p}\leq \widehat{p}+Z_\alpha \sqrt{\frac{\widehat{p}(1-\widehat{p}}{n}}

=0.253-(1.96)\sqrt{\frac{0.253(1-0.253)}{75}}\leq \widehat{p}\leq0.253+(1.96)\sqrt{\frac{0.253(1-0.253}{75}}

Confidence interval =0.1546\leq \widehat{p}\leq 0.3513

7 0
3 years ago
A flying disc has has a circumference of 81.64 cm what is the area of the flying disc used 3.14 for pie
katrin [286]

Answer:

530.66 cm squared

Step-by-step explanation:

c = 2(3.14)r

81.64 = 2(3.14)r

Divide both sides by 6.28

The radius is 13

a = 3.14(13 squared)

a = 530.66

8 0
3 years ago
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C + 1/4c<br> please help me i need this done now
abruzzese [7]

Answer:

1\frac{1}{4} c

Step-by-step explanation:

c+\frac{1}{4}c

Rewrite the expression

= 1c+\frac{1}{4} c

Add

= 1\frac{1}{4} c

Therefore, c+\frac{1}{4}c is equal to 1\frac{1}{4} c.

I hope this helps!

5 0
3 years ago
Plz answer!!!!!!!!!!!!!!​
makkiz [27]

Answer:

7

Step-by-step explanation:

i know

7 0
2 years ago
What is the factor of 15 and 35​
Ket [755]

Answer: 5 is the GCF

Step-by-step explanation: It just is

4 0
2 years ago
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