3 years ago

Please help me i will give brainlest its a important test

Mathematics

1 answer:

Feliz [49]3 years ago

3 0

Answer:

Step-by-step explanation:

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how much of a radioactive kind of bismuth will be left after 40 min if the half life is 20 min and you start with 960 grams?

Darya [45]

If the half life is 20 minutes, then in 40 minutes there is 2 half lives. At the end of Each half life, you will have 1/2 of the sample remaining. So...

After 20 min you have

960/2 = 480

After 40 minutes you will have

480/2 = 240 grams

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4 years ago

10% of a number is 6, what is the number?

zaharov [31]

60 cos 10% of 60 is 6

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3 years ago

What is m < WZY? *Brainliest for first correct answer* A 85 B 95 C 105 D 115

shutvik [7]

Answer:

m<WZY is 95º

Step-by-step explanation:

a line is 180º

180-85=95

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2 years ago

Read 2 more answers

Solve the equation a + b - c = 180 for a. *

spin [16.1K]

Answer:

a = 180 - b + c

Step-by-step explanation:

a + b - c = 180

Move b by subtracting b from both sides.

a - c = 180 - b

Move c by adding c to both sides.

a = 180 - b + c

Therefore a equals 180 - b + c.

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3 years ago

Find the average rate of change of f ( x ) = 3 x 2 − 9 on the interval [ 2 , b ] . Your answer will be an expression involving b

iVinArrow [24]

Answer:

$m = 3b+6$

Step-by-step explanation:

Given

$f(x)=3x^2 - 9$

Required

The average rate over $[2,b]$

Average rate (m) is calculated using:

$m = \frac{f(b) - f(a)}{b - a}$

Where

$[a,b] = [2,b]$

So, we have:

$m = \frac{f(b) - f(2)}{b - 2}$

Calculate f(b) and f(2)

$f(x)=3x^2 - 9$

$f(b)=3b^2 - 9$

$f(2)=3*2^2 - 9 = 12 - 9 = 3$

So, we have:

$m = \frac{f(b) - f(2)}{b - 2}$

$m = \frac{3b^2 - 9 - 3}{b - 2}$

$m = \frac{3b^2 - 12}{b - 2}$

Expand the numerator

$m = \frac{3b^2 + 6b-6b-12}{b - 2}$

Factorize

$m = \frac{b(3b + 6)-2(3b+6)}{b - 2}$

Factor out 3b + 6

$m = \frac{(b -2)(3b+6)}{b - 2}$

Cancel out b - 2

$m = 3b+6$

4 0

3 years ago