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melamori03 [73]
3 years ago
10

An element with mass 780 grams decays by 17.1% per minute. How much of the element is remaining after 19 minutes, to the nearest

10th of a gram?
Mathematics
1 answer:
VikaD [51]3 years ago
3 0

Answer:

  22.1 grams

Step-by-step explanation:

At the end of each minute, (1 -17.1%) = 82.9% of the element remains. At the end of 19 minutes, the quantity has been multiplied by that value 19 times, so the remaining amount is ...

   (780 g)(0.829^19) ≈ 22.1 g

After 19 minutes 22.1 grams remain.

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The side lenghts of a triangle are 14,15, and x units
iragen [17]

9514 1404 393

Answer:

  1 < x < 29

Step-by-step explanation:

The triangle inequality requires the sum of the two shortest sides exceed the longest side.

<u>When x and 14 are the shortest</u>:

  x + 14 > 15

  x > 1

<u>When 14 and 15 are the shortest</u>:

  14 +15 > x

  29 > x

Then the requirement for the length of x is ...

  1 < x < 29

_____

<em>Additional comment</em>

The length of the third side of a triangle can be between the difference and sum of the two given sides.

3 0
2 years ago
2y)(2y + 8) = ? A. 4xy – 16x – 4y2 – 16y B. 4xy + 16x – 4y2 – 16y C. 4xy – 4y2 D. 4xy + 16x + 4y2 + 16y 8…
Vilka [71]
4y^2 + 16y
You distribute the 2y into the 2y+8
8 0
4 years ago
I think i have the right answer but I don’t know how to show my work/explanation, please help! *GRADE 9 WORK*
IrinaK [193]

Answer:

5 boys

Step-by-step explanation:

boys to girls in math class = 3/12

3/12 can be reduced to 1/4

In the science class, the ratio is the same but there is a total of 20 girls.

Multiply the fraction 1/4 by 2/2, 3/3, 4/4, 5/5, etc. until you get x/20. Then you have 20 girls. x is the number of boys.

1/4 = 2/8 = 3/12 = 4/16 = 5/20

In science the ratio of 1/4 is the same as 5/20, so there are 5 boys.

Answer: 5 boys

4 0
4 years ago
8time-5=12time+1 solve the equation
zalisa [80]
1 * 12 = -40
12 = -40

Since its not possible for twelve to equal negative-forty, than there is no answer for this equation.

5 0
3 years ago
Please help me with this! if you know the answer, would you please explain it!
tia_tia [17]

Answer:

A

Step-by-step explanation:

175/7=25

11*25=275

14*25=350

9*25=225

12*25=300

They are all true on A

6 0
4 years ago
Read 2 more answers
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