3 years ago

What is the value of the expression below? - 1/2 + 3 1/2

Mathematics

2 answers:

tatyana61 [14]3 years ago

7 0

Answer:

It will be 3 :)

Step-by-step explanation:

Try using desmos calculator when it comes to math ;)

maria [59]3 years ago

3 0

3.
Hope this helps! :)

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4b+24=7b-8 Please show steps

LUCKY_DIMON [66]

4b+24=7b-8
32=3b
b=32/3
hope this helps!

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At the beach 29% of people have red towels and 18% have white towels if the rest have blue ,what percentage of the people at the

Sonbull [250]

The anwser is 53%....

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3 years ago

Read 2 more answers

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

4 7z+ 2 7z+(−9+11)=

UkoKoshka [18]

Answer:

what a fantastic day I would like

Step-by-step explanation:

uh oh is unavailable right now

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3 years ago

Help please x = 4 7 9

Fantom [35]

The answer to this question is 9

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2 years ago