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maxonik [38]
3 years ago
8

9+4x-5+12x-3x I am sooooo bad at math can I get some help please?!☹

Mathematics
2 answers:
Ghella [55]3 years ago
5 0
13x+4
Combine like terms
If there is a minus sign count it as a negative
Papessa [141]3 years ago
5 0
All you need to do is combine like terms
13x+4
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A consumer advocacy group wants to determine whether there is a difference between the proportions of the two leading automobile
podryga [215]

Answer:

The answer is "0.3206".

Step-by-step explanation:

H_0: p_1 = p_2\\\\H_a: p_1 \neq  p_2\\\\\hat{p_1} = \frac{X_1}{N_1} = \frac{53}{400} = 0.1325\\\\\hat{p_1}= \frac{X_2}{N_2} = \frac{78}{500}= 0.156\\\\\hat{p} = \frac{(X_1 + X_2)}{(N_1 + N_2)} = \frac{(53+78)}{(400+500)} = 0.1456

Testing statistic:

z = \frac{(\hat{p_1}- \hat{p_2})}{\sqrt{(\hat{p} \times (1-\hat{p}) \times (\frac{1}{N_1} + \frac{1}{N_2}))}}

=\frac{(0.1325-0.156)}{\sqrt{(0.1456\times (1-0.1456)\times (\frac{1}{400} + \frac{1}{500}))}}\\\\ = -0.99

Calculating the P-value Approach

\text{P-value}= 0.3206

7 0
2 years ago
1. The distance in feet that Karina swims in a race is represented by 4d-4, where d is the distance for each lap. What is an exp
Romashka-Z-Leto [24]

Answer:

Step-by-step explanation:

1. 2( 2d + 2)    

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3 0
3 years ago
sean needs to finish reading his book in four days. he reads 1/3 of the book on the first day, 1/4 of the book on the second day
emmainna [20.7K]

Answer:

60 pages

Step-by-step explanation:

Day 1 : 1/3 book

Day 2: 1/4 book

Day 3: 1/5 book

Day 4: 13 pages

Total days 1 through 3 = 1/3 + 1/4 + 1/5 = 20/60 + 15/60 + 12/60 = 47/60

Day 4 = 1 - 47/60 = 13/60

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2 years ago
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Answer: $25

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Find each sum simplify if possible
notsponge [240]
That's simplied already, unless they want a decimal then it's .6 or something
7 0
3 years ago
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