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2 years ago

Find the value of x and y 3x 20 25 18 6y-2- X= Y=

Mathematics

1 answer:

lapo4ka [179]2 years ago

7 0

Answer:

Step-by-step explanation:

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The amount of time it takes an ice cube to melt varies inversely to the air temperature. At 30 degrees Celsius, the ice will mel

Anon25 [30]

Answer:

hope this helps A block of ice melts in 2.5 hours when the temperature is 54 degrees.

Step-by-step explanation:therefore you can increase 2.5 and decrease 54 to whatever number you need

4 0

2 years ago

Y=4.5 when x=3<br> find the variation of k

torisob [31]

The variation of K is what is found in front of X

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3 years ago

In a survey of 300 T.V. viewers, 40% said they watch network news programs. Find the margin of error for this survey if we want

bixtya [17]

Answer:

Step-by-step explanation:

The formula for calculating the margin of error is expressed as;

$M.E = z * \sqrt{\frac{p*(1-p)}{n} }$ where;

z is the z-score at 95% confidence = 1.96 (This is gotten from z-table)

p is the percentage probability of those that watched network news

p = 40% = 0.4

n is the sample size = 300

Substituting this values into the formula will give;

$M.E = 1.96*\sqrt{\frac{0.4(1-0.4)}{300} }\\ \\M.E = 1.96*\sqrt{\frac{0.4(0.6)}{300} }\\\\\\M.E = 1.96*\sqrt{\frac{0.24}{300} }\\\\\\M.E = 1.96*\sqrt{0.0008}\\\\\\M.E = 1.96*0.02828\\\\M.E \approx 0.05543$

Hence, the margin of error for this survey if we want 95% confidence in our estimate of the percent of T.V. viewers who watch network news programs is approximately 0.05543

5 0

3 years ago

) Find AD if BC = 13x + 279.<br>AD = 2x + 135, AC = 11x + 267,<br>and BD = 63.

Cloud [144]

Answer:

efe

Step-by-step explanation:

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3 years ago

Plzz help me plzz! I am timed

Sunny_sXe [5.5K]

Answer:

The second answer, and fifth answer

Step-by-step explanation:

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3 years ago