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2 years ago

HELP!!!

Mathematics

2 answers:

irina1246 [14]2 years ago

8 0

Answer:

x=-120

x=-102

Step-by-step explanation:

Lady bird [3.3K]2 years ago

4 0

the answer is 210 and 201

hope this helps

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Four students spent $9.40 on school lunch.at this rate,predict the amount 10 students would spend on the same school lunch

Tom [10]

You will need to know how much each lunch cost
so
9.40 <span>÷ 4 = 2.35
so each lunch cost 2.35 dollars

now we need to find out how much it will cost for 10 lunches

10 x 2.35 = 23.5

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3 years ago

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Three times a certain number, n, is 21

Phantasy [73]

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Step-by-step explanation:

3n=21

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3 years ago

A fossil was analyzed and determined to have a carbon-14 level that is 80 % that of living organisms. the half-life of c-14 is 5

liq [111]

Answer:

The fossil is 1860 years old.

Step-by-step explanation:

The equation for the amount of fossil has the following format:

$Q(t) = Q(0)e^{rt}$

In which Q(t) is the amount after t years, Q(0) is the initial amount and r is the rate of change.

Half-life of c-14 is 5730 years.

This means that $Q(5730) = 0.5Q(0)$

$Q(t) = Q(0)e^{rt}$

$0.5Q(0) = Q(0)e^{5730r}$

$e^{5730r} = 0.5$

$\ln{e^{5730r}} = \ln{0.5}$

$5730r = \ln{0.5}$

$r = \frac{\ln{0.5}}{5730}$

$r = -0.00012$

$Q(t) = Q(0)e^{-0.00012t}$

How old is the fossil?

This is t for which

$Q(t) = 0.8Q(0)$

$Q(t) = Q(0)e^{-0.00012t}$

$0.8Q(0) = Q(0)e^{-0.00012t}$

$e^{-0.00012t} = 0.8$

$\ln{e^{-0.00012t}} = \ln{0.8}$

$-0.00012t = \ln{0.8}$

$t = -\frac{\ln{0.8}}{-0.00012}$

$t = 1860$

The fossil is 1860 years old.

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3 years ago

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Sophie [7]

Answer:im not really sure but i think log3(3) Logarithm base 3 of 3 is 1 .

Step-by-step explanation:

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3 years ago

What is the solution to the inequality x(x - 3) > 0?

Nimfa-mama [501]

Answer:

D) x<0 or x>3

Step-by-step explanation:

x(x-3)>0

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or x<0 and x-3<0 ..... negative-negative=positive so x<0

if x=0 then x(x-3)=0

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3 years ago