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Ne4ueva [31]
4 years ago
8

When solving a system of equations, how do you determine which method to use? (substitution, elimination, graphing)

Mathematics
1 answer:
balu736 [363]4 years ago
3 0
It just depends on the equation that you have to solve
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Radium-226 has a half life of 1622 years. If you start off with a 200
sweet [91]

Answer:

≈23.6 kg left.

Step-by-step explanation:

For determining this, we can simply use an exponential decay equation representing this scenario:

y= a(0.5)^{\frac{t}{h} }

a: the initial amount

t: the amount of time

h: the half life

Now, substitute the numbers into the equation:

y=200(0.5)^{\frac{5000}{1622} }

Now, solve this equation:

y=220(0.5)^{3.08}

Use a calculator to solve for y:

y= 200(0.118)

y≈23.6 kg left.

3 0
3 years ago
Solve the equation: x6=4.2
fomenos

Answer:

x * 6 = 4.2

x = 4.2 / 6 = 0.7

3 0
4 years ago
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13. When Juanita was on vacation it rained 35% of the days. She was on
Kipish [7]

Answer:

7 days

Step-by-step explanation:

35% of 20 =

.35 * 20 = 7

5 0
3 years ago
The width of a rectangle is 4 inches less than its length. The perimeter of the rectangle is 12 inches what is the width
Snezhnost [94]
Let the length is x and the width is y
x - y = 4 .........(1) 2x + 2y = 12
x + y = 6........(2) 
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3 years ago
Which of the given expressions results in 0 when evaluated at x = 5?
posledela

Answer:

C (x-8)(x-5)

Step-by-step explanation:

(5-8) = -3

(5-5) = 0

-3 x 0 = 0

5 0
3 years ago
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