What is a good science fair projects for 5th graders

1 answer:

8 0

I'm not sure of whether or not you're aware of this, but you asked this question in the math section. Nevertheless, I remember in 5th grade I did a project on whether or not it is possible to use solar energy to heat up different colored bags filled with water, and to determine which one would heat up the quickest. If that one doesn't pique your interest, you can go to sciencebuddies.com and search through a variety of project ideas if you'd like. That's where I found mine.

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two painters are working together and can paint a house in 3 hours. One painter alone can paint the same house in 8 hours. How m

Katyanochek1 [597]

For this case, the first thing we must do is define a variable.
We have then:
x: number of hours it takes the second painter to paint the house working alone.
We have then that the equation that models the problem is:
$\frac{1}{x} + \frac{1}{8} = \frac{1}{3}$
From here, we clear the value of x.
We have then:
$\frac{8x}{x} + \frac{8x}{8} = \frac{8x}{3}$
$8 + x = \frac{8x}{3}$
$24 + 3x = 8x$
$24 = 8x-3x

24 = 5x

$
$x = \frac{24}{5}$
$x = 4.8
$
Answer:
It would take the second painter to paint the house by himself about 4.8 hours.

3 0

3 years ago

Find the product of (-8) and (-13).<br> 21<br> 94<br> 103<br> 104

katrin [286]

(-8)(-13) is 104, because it is multiplication. Hope this helps.

8 0

3 years ago

Complete the point-slope equation of the line through (-4, 8) and (4, 4).

avanturin [10]

Answer:

y-4=-1/2(x-4)

Step-by-step explanation:

point slope form: y-y1=m(x-x1)

every time x increases by 8, y decreases by 4. slope can be found by rise/run. the slope is -4/8 which is -1/2, which means m=-1/2. in the given equation, it said y-4. It plugged in 4 for y1, meaning it was talking about the second given point, which was (4,4). plug in 4 for x and you get y-4=-1/2(x-4)

4 0

2 years ago

A number added to its reciprocal is 2<img src="https://tex.z-dn.net/?f=%5Cfrac%7B9%7D%7B20%7D" id="TexFormula1" title="\frac{9}{

brilliants [131]

The number is $\frac{49+3\sqrt{89}}{40}$ OR $\frac{49-3\sqrt{89}}{40}$