anonymous
  • anonymous
help??
Algebra
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Hi! What do you need help with?
anonymous
  • anonymous
What you need help with?
anonymous
  • anonymous
1. Suppose that the amount of algae in a pond doubles every 4 hours. If the pond initially contains 90 pounds of algae, how much algae will be in the pond after 12 hours? (1 point) 720 pounds 360 pounds 1,440 pounds 114 pounds

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anonymous
  • anonymous
Alright, this sounds pretty easy! Okay, so, it doubles every hour.
anonymous
  • anonymous
it will double three times since \(12\div 4=3\)
anonymous
  • anonymous
if we start at 90, after 4 hours it will be how much?
anonymous
  • anonymous
180
anonymous
  • anonymous
Yep! so, then we add 4 more hours to that to make it 8 hours. How much is it now?
anonymous
  • anonymous
360
anonymous
  • anonymous
Yep! now, lets add a final 4 hours to make it 12. How much is it now?
anonymous
  • anonymous
720
anonymous
  • anonymous
Yep! So, at 12 hours there will be 720 pounds of algae :) Great job anna!
anonymous
  • anonymous
2. What is the order of the numbers from least to greatest? A = 6.2 × 10–5 B = 12.3 × 10–7 C = 5.2 × 103 D = 3.7 × 10–5 (1 point) D < C < A < B B < D < A < C D < C < A < B B < A < C < D
anonymous
  • anonymous
Okay, well first we need to simplify this, and multiply them. After you do this, what do you get?
anonymous
  • anonymous
(Dont forget the order of operations, multiplication comes before subtraction)
anonymous
  • anonymous
So, for A, you would do (6.2 x 10) - 5
anonymous
  • anonymous
i cant figure out how to find 5.2x10^3
anonymous
  • anonymous
Okay, well you would do the exponent first (im assuming thats an exponent?) so, you would do 10 x 10 first, which equals 100. then, 100 x 10 which equals 1000. From there, you take 1000 x 5.2 which is?
anonymous
  • anonymous
5200
anonymous
  • anonymous
they are actually all exponents
anonymous
  • anonymous
Oh, can you re-write them with the ^ like you did the last time to make it for clear? If not, let me know if you have a difficulty and i can explain it :) after we multiply this, it should be very easy to see the smallest number, greatest number, and everything in-between :)
anonymous
  • anonymous
And yes, 5200 is correct :) Good job!
anonymous
  • anonymous
2. What is the order of the numbers from least to greatest? A = 6.2 × 10^–5 B = 12.3 × 10^–7 C = 5.2 × 10^3 D = 3.7 × 10^–5 (1 point) D < C < A < B B < D < A < C D < C < A < B B < A < C < D
anonymous
  • anonymous
Okay, that helps, thank you. Well, now we know that C = 5200. Have you done A and B as well?
anonymous
  • anonymous
idk how to do it with negatives
anonymous
  • anonymous
Well, there are some rules when multiplying integers. Positive x negative = negative Positive x positive = positive negative x negative = positive negative x positive = negative So, 2 positives makes a positive. 2 negatives makes a positive, and 1 negative makes a negative. I know it probably will be hard to learn, but youll get it eventually :) Practice makes perfect! And dont be afraid to look it up if you need to :)
anonymous
  • anonymous
i cant figure it out

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