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3 years ago

Half-life formula: A = A0(0.5) t/h

Mathematics

2 answers:

Dahasolnce [82]3 years ago

8 0

Answer: the answer is 4

Step-by-step explanation:

when looking for the half life, it says to look for when the initial amount is half of what it used to be, because it is 100, 100 divided by 2 is 50, and when looking at the hours (x value) for 50 it says 4.

Temka [501]3 years ago

3 0

Answer:

4 hours

Step-by-step explanation:

on edge 2020

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Write the phrase "6 more than 8 divided by x is 10" as a variable expression

Degger [83]

It’s : (6 + 8)/x = 10

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3 years ago

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Lauren pays $19.99 for a membership fee to an online music store. Lauren buys songs from a new album at the price of $0.99 each.

sdas [7]

The right answer is Option B.

Step-by-step explanation:

Let,

Number of songs = x

Price of 1 song = $0.99

Membership fee = $19.99

Total amount paid = $21.97

According to given statement;

0.99x+19.99=21.97

Subtracting 19.99 from both sides

$0.99x+19.99-19.99=21.97-19.99\\0.99x=1.98$

Dividing both sides by 0.99

$\frac{0.99x}{0.99}=\frac{1.98}{0.99}\\x=2$

Lauren bought 2 songs.

The right answer is Option B.

Keywords: Linear equation, subtraction

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4 years ago

Valeria has been training for the Charlestown cruisers bike race. The first week she trained, she rode 5 days and took the same

ira [324]

The number of miles covered every evening obtujwd using a system of equation is 15 miles.

Let the number of miles per evening = m

Number of days = 5

Number of miles per morning = 8 miles

Total miles covered = 115 miles

Using the expression below :

Number of days(miles per morning + miles per evening) = 115 miles

5(8 + m) = 115

40 + 5m = 115

5m = 115 - 40

5m = 75

m = 75 / 5

m = 15 miles

Therefore, the Number of miles covered per evening is 15 miles.

Learn more : brainly.com/question/18796573

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3 years ago

Will mark brainliest!!! Solve for x

Anna [14]

Answer:

Step-by-step explanation:

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3 years ago

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What is the solution for this inequality? -4x ≤ 28 A. x ≥ -7 B. x ≤ 7 C. x ≤ -7 D. x ≥ 7

svetoff [14.1K]

Answer:

$\boxed{Option A }$

Step-by-step explanation:

=> $-4x \leq 28$

Dividing both sides by -4

=> $x \geq 28/-4$

=> $x \geq -7$

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4 years ago