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love history [14]

3 years ago

10

Please help me !! Answer both correctly for a brainliest and also a thanks :)

1 answer:

neonofarm [45]3 years ago

6 0

The firs t res is x=4
the second is D

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Niobium-91 has a half-life of 680 years. After 2,040 years, how much niobium-91 will remain from a 300. 0-g sample? 3 g 18. 75 g

alekssr [168]

Answer:

Amount of Niobium-91 initially

= 300/91 =3.2967mol

2040 years = 3 ×680 = 3 half-lives

therefore, amount left = 0.4121mol

mass of Niobium-91 remaining = 0.4121 ×91 =37.5g

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2 years ago

The local theater sells tickets to its plays at a rate of $38 each. Patrons who attend multiple shows are encouraged to buy an a

Mekhanik [1.2K]

Answer:

Roger

Step-by-step explanation:

Since he is attending more shows, he will benefit. He will save a net amount of $40

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3 years ago

List elements in..<br> {x | x is an even counting number smaller than 8}

ohaa [14]

Answer:

x l 0 2 4 6

Step-by-step explanation:

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3 years ago

Nina worked 32 hours this week. She earned a total of 360. How much does she make per hour? Write and solve equation.

NeX [460]

Nina makes 11.25 per hour.

Step-by-step explanation:

Given,

Number of hours worked by Nina = 32 hours

Amount earned by Nina = 360

Let,

x represent the amount earned by Nina per hour.

Amount per hour * Number of hours = Amount earned

$32*x=360\\32x=360$

Dividing both sides by 32

$\frac{32x}{32}=\frac{360}{32}\\x=11.25$

Nina makes 11.25 per hour.

Keywords: variable, equation

Learn more about variables at:

#LearnwithBrainly

5 0

3 years ago

Please answer this correctly

GREYUIT [131]

0 Minutes 18 Seconds

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3 years ago