3 years ago

How to use 1 to 9 digits to make the sum of 999

Mathematics

1 answer:

pantera1 [17]3 years ago

3 0

Can the numbers be repeted!!!!!!!!!!!!!!!!!!!!!!!!!

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Element X decays radioactively with a half life of 9 minutes. If there are 760 grams of Element X, how long, to the nearest tent

ElenaW [278]

Answer:

Step-by-step explanation:

760·0.5^(t/9) = 19

0.5^(t/9) = 19/760

2^(-t/9) = 0.025

-t/9 = log₂(0.025)

t = -9log₂(0.025) = 47.9 minutes

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2 years ago

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Please help me with these 3 problems ASAP.

r-ruslan [8.4K]

Answer:

For the first question(B)

x=-2

x=5

For part C, the question is not clear

For the last question, the approximated value is -5/4

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3 years ago

Using f (x) = 4x + 3 and g(x) = x - 2, f(g(5))=

il63 [147K]

Answer:

I think It is 7

Step-by-step explanation:

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3 years ago

PLEASE help with the equation!!!

tatyana61 [14]

Step-by-step explanation:

the patern (3n - 1) is incorrect,

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3 years ago

Select TWO values of x that are roots

Sauron [17]

$x_1=\dfrac{-b-\sqrt{b^2-4ac}}{2a};\ x_2=\dfrac{-b+\sqrt{b^2-4ac}}{2a}\\\\y=x^2+3x+5\\\\a=1;\ b=3;\ c=5\\\\b^2-4ac=3^2-4(1)(5)=9-20=-11\\\\x_1=\dfrac{-3-\sqrt{-11}}{2\cdot1}=\dfrac{-3-\sqrt{-11}}{2}\\\\x_2=\dfrac{-3+\sqrt{-11}}{2}$

Answer: A and B.

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3 years ago

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