2 years ago

I need help for the second one

Mathematics

1 answer:

dolphi86 [110]2 years ago

6 0

Equation
(3x21)+(3x15)

Answer
$108

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Marcus solved for x in the quadratic equation x2 – 10x + 25 = 0. x = x = x = What is true about Marcus’s work? Check all that ap

aniked [119]

Marcus should have substituted -10for b, not 10
Marcus should have subtracted 4(1)(25) in the square root
This equation, when solved correctly, only has one real number solution

So A, C, D

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3 years ago

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An element with mass 130 grams decays by 22% per minute. How much of the element is remaining after 7 minutes, to the nearest 10

shepuryov [24]

22.8 grams of element will be remaining after 7 minutes

Further explanation:

Given

$Mass\ of\ element=130g\\Percentage\ of\ reduction=22\%$

The element reduces (1-22%) in one minute.

The process will be repeated 7 times for 7 minutes

If we have to calculate the amount of element after 7 minutes

then the total reduction will be: (1-22%)^7

$Remaining\ amount=130*(1-22\%)^7\\=130*(1-0.22)^7\\=130*(0.78)^7\\=130*0.18\\=22.84g\\Rounding\ off\ to\ nearest\ tenth\\=22.8g$

22.8 grams of element will be remaining after 7 minutes

Keywords: Decay, Percentage

Learn more about percentage at:

#LearnwithBrainly

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3 years ago

.35 convert into pecentage

Whitepunk [10]

.35 as a percentage would be 35%.

.35 = 35 / 100 as a fraction

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What is 3,072/3 Explain in steps,Answer quick

Paha777 [63]

1024 is the answer to this problem.

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Everyday day Marvin exercises for 48 minutes.How many days will it take him to exercise for 576 minutes.

wel

It will take Marvin 12 days to exersise for 576

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