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3 years ago

I need the answer please and can u answer my recent to.

Mathematics

1 answer:

ale4655 [162]3 years ago

3 0

Answer:

30 hours.

Step-by-step explanation:

Richard can build 15 snowballs in 1 hour

But 2 snowballs melt every 15 minutes

In 1 hour, the number of snowballs that will have melted is:

$\frac{60}{15}$ × 2 = 8

The number of snowballs that will have remained = 15 - 8 = 7

So 7 snowballs will have remained in 1 hour

For 210 snowballs to have remained, it will take:

$\frac{210}{7}$ × 1 = 30 hours.

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What is the value of x<br> 12(x-2)+3x=2(x+6)+3

RSB [31]

Answer:X = 3

Step-by-step explanation:

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3 years ago

Expand and simplify 9(2x + 3) + 4x

aleksandr82 [10.1K]

Answer:

22x+27

Step-by-step explanation:

Let's simplify step-by-step.

9(2x+3)+4x

Distribute:

=(9)(2x)+(9)(3)+4x

=18x+27+4x

Combine Like Terms:

=18x+27+4x

=(18x+4x)+(27)

=22x+27

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2 years ago

Read 2 more answers

What is the quotient 2y^-6y-20/4y+12 ÷ y+5y+6/3y^2+28y+27

malfutka [58]

Answer with explanation:

$\rightarrow \frac{\frac{2y^2-6 y-20}{4 y+12}}{\frac{y^2+5 y+6}{3 y^2+28 y+27}}\\\\\rightarrow \frac{\frac{y^2-3y-10}{2 y+6}}{\frac{(y+2)(y+3)}{3 y^2+28 y+27}}\\\\\rightarrow \frac{\frac{(y-5)(y+2)}{2 (y+3)}}{\frac{(y+2)(y+3)}{3 y^2+28 y+27}}\\\\\rightarrow \frac{(y-5)(y+2)}{2 (y+3)}} \times {\frac{3 y^2+28 y+27}{(y+2)(y+3)}}\\\\ \rightarrow\frac{(y-5)\times(3 y^2+28 y+27)}{2 (y+3)^2}}$

→y²+5y+6

=y²+3 y+2 y+6

=y×(y+3)+2×(y+3)

=(y+2)(y+3)

→y² -3 y-10

=y² -5 y+2 y -10

=y×(y-5)+2×(y-5)

=(y+2)(y-5)

6 0

3 years ago

Read 2 more answers

What is the median of these numbers :<br> 65,56,76,65,52,89,41

aleksklad [387]

Answer:

Step-by-step explanation:

You find the one equally in the center of the numbers after they are in order.

7 0

2 years ago

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What is the standard deviation of the data set? Round to the nearest tenth if needed. 2, 4, 7, 8, 9

barxatty [35]

Hiiiiiiii, okay here's the full- explanation for you, so here's the final answer. The explanation of how i got the answer is also below! Hope this helped you!!

Answer:

2.9

Step-by-step explanation:

First the mean or average = sum / data points (or N) = (2 + 4 + 7 + 8 + 9) / 5 = 6

Now we take each of the individual values subtract the mean, and then square them, and add it all up.

(2 - 6)^2 + (4 - 6)^2 + (7 - 6)^2 + (8 - 6)^2 + (9 - 6)^2 = 34

Then we divide this by degrees of freedom = N - 1 to find the sample standard deviation. Note that this is different from the population standard deviation, where we would just divide N, but we use this because our data set is small, like less than 30 points.

34 / (N - 1) -----> = 34 / (5 - 1) = 8.5

Now, this is the variance, so we take the square root of the variance to get the sample standard deviation:

√(8.5) = 2.9 (rounded to 1 decimal place)

Note that scientific calculators, even my $20 version can do these kind of statistics calculations. Just enter the data set as a table of values in statistics mode, and press a few buttons, you're done!

6 0

3 years ago