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4vir4ik [10]
2 years ago
11

Solve the systems of equations using substitution.

Mathematics
1 answer:
statuscvo [17]2 years ago
8 0

I'm sure on boxes 1 and 3 but not on the 2nd box

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Helpppppppppppppp meeee!!!!
Oduvanchick [21]
The answer is 10 days

(after 4 days, they still needed to install 360 chairs, 600-360=240 - meaning they installed 240 chairs in 4 days. to find out how many chairs they installed in 1 day, divide 240 by 4 and you find they installed 60 chairs per day. Then divide 360 by 60 to find the remaining days needed to install the rest of the chairs, which is 6 days then add it onto the 4 days already completed)
4 0
2 years ago
e 400 trials in which the assistant maintained a neutral expression, the driver stopped in 229 out of the 400 trials. Find a 95%
Fittoniya [83]

Answer:

Step-by-step explanation:

n = 400

Proportion p = 229/400= 0.5725

For 95% confidence interval we use Z value as 1.96

Std error = 0.025

margin of error = 1.96*0.025

Confidence interval 95% = 0.5725±Margin of error

= (0.524, 0.621)

b) When smiled x becomes 277

p = 0.6925

Std error = 0.023

Margin of error= 1.96*0.023

Confidence interval = (0.647, 0.738)

Smiling increases the chances of stopping since mean and conidence interval bounds are showing increasing trend.

6 0
2 years ago
Can u help me step by step need to fill in the blanks
Rina8888 [55]
-18a+17b is the answer because you multiply by -1 to each
6 0
3 years ago
Read 2 more answers
I need help showing the work on this problem is 751.2÷25= need help
JulsSmile [24]

Answer: 30.048

Try a calculator, it can help a lot!

6 0
3 years ago
Write the percent as a fraction in simplest form<br><br> 16.24%
Alja [10]
16 24/100 or 16 6/25
3 0
3 years ago
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