The Official Homework Help Thread
- Thread starter Zandy
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i can help with that. may i ask what this drawing is for?
atomic number (8 in this example) is the number of protons; and mass number (17 in this example) is the number of both protons and neutrons added together. so to get the answer, you should do mass number minus the atomic number!
i wrote number so many times it doesnt look like a word anymore
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This is supposed to be a welcoming environment to ask for help. Do NOT comment on someone's skill level on a subject. Be respectful of all users regardless of what they know or do not know.
Please, Karla, keep this in mind
JellyDitto
doot doot
I need help with algebra 1 rip. Im doing something on slopes with converting between standard and slope intercept form.
So the question is : 1. You have 2 part time jobs working at a grocery store and at a clothing store. You earn $7.65 per hour at the grocery store and $8.50 per hour at the clothing store. For the week, you earn $229.50. Write an equation for this in standard form.
So I got 7.65x+8.50y=229.50
2. Write an equation in slope intercept form
................-7.6
So I got y= 8.5 x + 27
The 3rd question has to do with graphing, but i not gonna even bother with that atm
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So the question is : 1. You have 2 part time jobs working at a grocery store and at a clothing store. You earn $7.65 per hour at the grocery store and $8.50 per hour at the clothing store. For the week, you earn $229.50. Write an equation for this in standard form.
So I got 7.65x+8.50y=229.50
2. Write an equation in slope intercept form
................-7.6
So I got y= 8.5 x + 27
The 3rd question has to do with graphing, but i not gonna even bother with that atm
- - - Post Merge - - -
bump
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i really should have known this for awhile now, but i just want to make make sure my understanding on this concept is correct. so if i have to convert something like 0000002509 into scientific notation, i place the decimal between the 2 and the 5 if im not mistaken so its 2.509x10^-8?
tbh i ignored this back in middle school but i was blind to the fact that it would come back to get me
tbh i ignored this back in middle school but i was blind to the fact that it would come back to get me
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Your standard form equation looks fine ^^. The only problem I can see is a small error that was probably just a quick mistake when converting from standard form to slope-intercept form:
8.50y = -7.65x + 229.50
y = (-7.65/8.50)x + (229.50/8.50)
y = -0.9x + 27
If you need help with graphing this line, just note that you only need two points on a line to draw the line! The slope-intercept form y = mx + b always gives you one point, namely the y-intercept which occurs at (0, b) [in the example above, the y-intercept is located at (0, 27). You can then find another point on the line by selecting any value of x or y and finding the corresponding value (of x or y). For example, setting x = 1 gives y = 26.1, so the point (1, 26.1) is on your line. You can them plot these two points and connect them and the resulting line will be the graph of... well, the line xD.
If I'm understanding your question correctly, you are converting 0.0000002509 into scientific notation. To get the correct solution, you would move the decimal over to the right until it is 2.509 and multiply it 10 to the power of the number of places you moved to the right (or left if you are going to the other way). Since you moved to the right, it would be 2.509*10^(
EDIT: It's -7, not -8. Accidentally miscounted (been a long day). >.<
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In general you want only a single nonzero digit to the left of the decimal, so yes ^^.
If in your example above you meant to type 0.000002509 (sorry, there was no decimal included so I assume it was meant to be placed here xD) then you'd actually move the decimal 6 spots to the right. Moving a decimal to the right results in a negative exponent, so you'd write 0.000002509 = 2.509 x 10^(-6). I hope that helps!
(Be sure to check that -6 is the correct exponent for where the decimal was supposed to be placed in the original number and since I just woke and I'm not that apt at counting at the moment
).
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ah, yeah i know its supposed to be negative. i just always forget to add the negative sign haha - thank you, just wanted to make sure im putting the decimal in the right place. i wasnt completely sure about it before so sometimes i add it to the right of the number and sometimes i add it to the left without thinking through it
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In general you want only a single nonzero digit to the left of the decimal, so yes ^^.
If in your example above you meant to type 0.000002509 (sorry, there was no decimal included xD) then you'd actually move the decimal 6 spots to the right. Moving a decimal to the right results in a negative exponent, so you'd write 0.000002509 = 2.509 x 10^(-6). I hope that helps!
(Be sure to check that -6 is the correct exponent since I just woke and I'm not that apt at counting at the moment
EDIT: It actually is -7, not -8. I somehow miscounted. >.>
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