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3 years ago

Please help I will give brainly

Mathematics

2 answers:

Volgvan3 years ago

5 0

Answer:

Step-by-step explanation:

BC you need to add upall of them then devide by 1/4 and then oyu have your answer

Aleonysh [2.5K]3 years ago

5 0

It’s 30 1/4 inch cubes so it’s 30in^3

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Pls answer this question

AysviL [449]

Answer:

A and C

Step-by-step explanation:

5 0

4 years ago

Question 3 (1 point) Co-60 has a half life of 5.3 years. If a pellet that has been in storage for 26.5 years contains 14.5g of C

Zarrin [17]

Answer:

464 grams.

Step-by-step explanation:

Amount of substance:

The amount of substance after t years is given by an equation in the following format:

$A(t) = A(0)(1-r)^t$

In which A(0) is the initial amount and r is the decay rate, as a decimal.

Co-60 has a half life of 5.3 years.

This means that:

$A(5.3) = 0.5A(0)$

We use this to find r. So

$A(t) = A(0)(1-r)^t$

$0.5A(0) = A(0)(1-r)^{5.3}$

$(1-r)^{5.3} = 0.5$

$\sqrt[5.3]{(1-r)^{5.3}} = \sqrt[5.3]{0.5}$

$1 - r = 0.5^{\frac{1}{5.3}}$

$1 - r = 0.8774$

$A(t) = A(0)(0.8774)^{t}$

If a pellet that has been in storage for 26.5 years contains 14.5g of Co-60, how much of this radioisotope was present when the pellet was put in storage?

We have that $A(26.5) = 14.5$ , and use this to find A(0). So

$A(t) = A(0)(0.8774)^{t}$

$14.5 = A(0)(0.8774)^{26.5}$

$A(0) = \frac{14.5}{(0.8774)^{26.5}}$

[tex]A(0) = 464[tex]

464 grams.

3 0

3 years ago

Pls help I’ll mark you as brainliest <33

Zinaida [17]

Answer:

Step-by-step explanation:

this is very simple. since the angles are opposite the intersection of two lines, you know they must be equal.

therefore:

97 = 8t +1

solve for t:

t = 12

4 0

3 years ago

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Find x if:

kirza4 [7]

Answer:

x = 11

Step-by-step explanation:

x + 5 = 2(x - 3)

x + 5 = 2x - 6

(x - x) + 5 = (2x - x) - 6

5 = x - 6

5 + 6 = x (- 6 + 6)

x = 11

5 0

3 years ago

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What is the largest value of $k$ such that the equation $6x - x^2 = k$ has at least one real solution?

podryga [215]

Step-by-step explanation:

6x - x² = k

=> x² - 6x + k = 0,

For there to be at least 1 real solution,

The discriminant b² - 4ac must be at least 0.

We have (-6)² - 4(1)(k) >= 0.

Therefore 36 - 4k >= 0, k <= 9.

Hence the largest value of k is 9.

5 0

3 years ago

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