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mel-nik [20]
3 years ago
12

1. Which function represents exponential decay?

Mathematics
1 answer:
MatroZZZ [7]3 years ago
7 0

Answer:

y= 7^-t

Step-by-step explanation:

Equation for exponential decay:

An equation represents exponential decay if a term between 0 and 1 is elevated to the independent variable.

In this question:

First option 4 is elevated, so not exponential decay.

Second option:

7^{-t} = \frac{1}{7^t} = (\frac{1}{7})^{t}

0 < \frac{1}{7} < 1, thus, the second option represents exponential decay.

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Mrrafil [7]
1/a

The b^-3 in the denominator and numerator cancel out
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3 years ago
Help please!! i don’t really understand these
Inessa [10]

Answer:

I dont know ans to this q

me too pls follow

7 0
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Function or not a function.
trapecia [35]

Answer:

Not a function

Step-by-step explanation:

For 0 in the domain (input), there are two possible values in the output (range). This goes against the definition of a function, where every element in the domain must have only one value in the range.

Hope this helps!

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2 years ago
Plz help ASAP!!<br><br> Which two rational numbers does v14 lie between?
Elanso [62]

Answer:

19/8 and 22/7

Step-by-step explanation:

8 0
2 years ago
A community hall is in the shape of a cuboid.
yulyashka [42]

Answer:

The total paint cost is £380. The total tiles cost is £1800. The total cost is £2180.

Step-by-step explanation:

To know the cost, you need to calculate the area of the community hall.

  • Area of the ceiling/floor: 40m x 15m =  600m2

So together, their area is 1200m2.

  • Area of the small walls of the community hall: 15m x 3m = 45m2/each wall

Together the two walls have an area of 90m2

  • Area of the big walls of the community hall: 40m x 3m = 120m

Together the two big walls have an area of 240m2

  • So, therefore, the total area of the community hall: 1530m2

<em><u>Painting:</u></em>

They are going to paint the walls and the ceiling and each 10L tin covers 25m2 so:

Area of the walls and ceiling = 600m2 + 90m2 + 240m2 = 930m2

930m2 ÷ 25m2 = 37.5 tins. Since you can't have half a tin, they will need 38 10L tins.

38 x £10 = £380

<em><u>Floor:</u></em>

1m2 floor tiles costs £3 so 600m2 x £3 = £1800

<u><em>Total:</em></u>

£1800 + £380 = £2180

<em><u /></em>

7 0
2 years ago
Read 2 more answers
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