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3 years ago

9

If 96 grams of carbon-14 are originally present in a fossilized plant at the present time, how much will remain after 17,000 yea

rs? (The half-life of Carbon-14 is 5730 years.) Use the exponential decay model for Carbon-14: A=Aoe^(-.000121)t

1 answer:

Elden [556K]3 years ago

5 0

Well, you already have the decay model, so just plug that in

$\bf A=96e^{-0.000121\cdot 17000}\implies A=96e^{-2.057}$

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Dana needs 300 pickets for her colorful picket fence. She wants equal amounts of each of her 4 selected colors. She already has

Pavlova-9 [17]

Dana would need 75 pickets of each color to have an equal amount.

75x4=300

She would need 43 more red pickets to equal 75. (32+43=75)

49 more green pickets to equal 75 (26+49=75)

66 more yellow pickets to equal 75 (9+66=75)

75 blue pickets to equal 75. (0+75=75)

7 0

3 years ago

Read 2 more answers

The diameter of a circle has endpoints at (0,11) and (-6,-1). Write the equation of the circle in standard form.

Nata [24]

Answer:

(x - 3)^2 + (y - 6)^2 = 17

Step-by-step explanation:

The standard form of a circle's equation is (x-h)² + (y-k)² = r² where (h,k) is the center and r is the radius.

(x - 3)^2 + (y - 6)^2 = 17

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3 years ago

Cindy and Zoey work at a store. Both girls earn $6.25 per hour

wolverine [178]

Answer:

Step-by-step explanation:

I think this is your full question, right?

<em>Cindy and Zoey work at a store. Both girls earn $6.25 per hour. During a normal week Cindy works 15 hours and Zoey works 20 hours. The expression 6.25(15) + 6.25(20) can be used to calculate the total amount of money that the girls earned in one week. Which expression shows another way to calculate the amount of money the girls earn in one week? </em>

My answer:

The expression shows another way must be equal to: <em>6.25(15) + 6.25(20) </em>

<=> 6.25 (15+20)

Because both girls earn the same per hour.

8 0

3 years ago

PLEASE HELP!!!!!!!!!!!!!!!!!!!!!

ivann1987 [24]

1 + 1x
"the sum of one and" 1 +
"the product of" x
"one" 1 x
"and a number x" 1 x (x)
1 + 1x

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3 years ago

A student downloaded a new game on her phone that was recommended by her friend. She wanted to show her friend how good

anygoal [31]

Answer:

a. 587

b. 543

Step-by-step explanation:

a. Mean = sum / number of numbers

To find the sum, we can add the numbers up.

432 + 543 + 348 + 788 + 823 = 2934

There are 5 numbers. Our mean is thus

2934/5 = 586.8, or 587 when rounding up. We round up because we have a .8 at the end, and 8 ≥ 5

b. To find the median, we first must order the numbers. The numbers ordered are this:

348 , 432 , 543 , 788 , 823

To find the median, we can cross off one number on each side until we are left with one or two numbers.

348 , 432 , 543 , 788 , 823

cross out one number from each endpoint

432 , 543 , 788

cross out one number from each endpoint

543

7 0

2 years ago