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PSYCHO15rus [73]
3 years ago
12

Matthew has been observing 10 bacteria in a petri dish for his science class. If the bacteria population doubles every 12 hours,

how many bacteria will be in the dish after 2 full days?
A. 20 bacteria
B. 40 bacteria
C. 80 bacteria
D. 160 bacteria
Mathematics
1 answer:
zheka24 [161]3 years ago
5 0
B 40 bacteria that's the answer lol
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Suppose y varies inversely with x. Write an equation if y=7 when x=-4
luda_lava [24]

Answer:

y = -28 ÷ x

Step-by-step explanation:

The standard format of a inversely proportional equation goes by the format of y = k ÷ x. The question asks us to write an equation if y = 7 when x = -4 and y varies inversely with x.

So we substitute the values y = 7 and x = -4 in the equation y = k ÷ x

K = constant, we have to work this out

7 = k ÷ -4

7 × - 4 = k

k = - 4 × 7

k = -28

k = -28 So then we put this back into the original y = k ÷ x to find our final equation which is y = -28 ÷ x

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Answer:

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