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3 years ago

In parallelogram abcd,

Mathematics

1 answer:

nasty-shy [4]3 years ago

7 0

Answer:

The third option

M<A + 2• m<A = 180

Step-by-step explanation:

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Element X decays radioactively with a half-life of eight minutes. If there are 800 g of element X, how long, to the nearest 10th

Harman [31]

Answer: 41.5 min

Step-by-step explanation:

This problem can be solved with the Radioactive Half Life Formula:

$A=A_{o}.2^{\frac{-t}{h}}$ (1)

Where:

$A=22 g$ is the final amount of the radioactive element

$A_{o}=800 g$ is the initial amount of the radioactive element

$t$ is the time elapsed

$h=8 min$ is the half life of the radioactive element

So, we need to substitute the given values and find $t$ from (1):

$22 g=(800 g) 2^{\frac{-t}{8 min}}$ (2)

$\frac{22 g}{800 g}=2^{\frac{-t}{8 min}}$ (3)

$\frac{11}{400}=2^{\frac{-t}{8 min}}$ (4)

Applying natural logarithm in both sides:

$ln(\frac{11}{400})=ln(2^{\frac{-t}{8 min}})$ (5)

$-3.593=-\frac{t}{8 min}ln(2)$ (6)

Clearing $t$ :

$t=41.46 min \approx 41.5 min$ This is the time elapsed

7 0

3 years ago

Pls help me! I’m so confused on how to do this my teacher isn’t the best at explaining math… I need #4 a,b,c,d answers. Again pl

Ugo [173]

Answer:

I'll answer if u make my Answer Brainliest!!! <33333333

I know the answer btw!

Step-by-step explanation:

Also HII <3

3 0

3 years ago

The denominator of a rational numbers is twice it’s numerator if the numerator is decreased by 3 and the denominator increased b

ASHA 777 [7]

Answer:

$\frac{29}{58}$

Step-by-step explanation:

let x be the numerator of the rational number then 2x is the denominator

original fraction = $\frac{x}{2x}$

subtracting 3 from numerator and adding 7 to denominator , gives

$\frac{x-3}{2x+7}$ = $\frac{2}{5}$ ( cross- multiply )

5(x - 3) = 2(2x + 7) ← distribute parenthesis on both sides )

5x - 15 = 4x + 14 ( subtract 4x from both sides )

x - 15 = 14 ( add 15 to both sides )

x = 29

rational number = $\frac{29}{58}$

8 0

2 years ago

Grayson can read 18 pages of a book in 30 minutes. At that rate, how long would it take Grayson to read 150 pages? Express your

ratelena [41]

Answer:

4 hours and 10 min

Step-by-step explanation:

For this equation we will do ratios:

$\frac{18}{30} =\frac{150}{x} \\\\18x=4500\\x=250$

250 min =

4 hours and 10 min

4(60) = 240

240 + 10 = 250 minutes

6 0

3 years ago

a bag contains 3 red marbles and 6 blue marbles what it the probability of randomly selecting a red marble from the bag?

DochEvi [55]

Answer:

33%

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers