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katovenus [111]

2 years ago

9

Write an expression that represents the total number of cars sold during the first half of the year Cars sold : 5, 5, 6, 6, 7, 8

, 8, 8, 9, 9, 10, 10, 10, 10, 10, 11, 12, 12, 12, 15, 15

1 answer:

Dmitry_Shevchenko [17]2 years ago

5 0

2/5, 2/6, 1/7, 3/8, 2/9, 5/10, 1/11, 3/12, 2/15

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A decimal that stops (like 2.48) is which type of number?

Ostrovityanka [42]

Answer: B rational

Step-by-step explanation:

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3 years ago

a toy company spends $1,500 each day for factory expenses plus $8 per teddy bear which sells for $12 each. How many bears must t

Lunna [17]

1500÷8
1500÷12
subtract

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2 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 $Q(5730) = 0.5Q(0)$

So

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

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

$e^{5730r} = 0.5$

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

$5730r = \ln{0.5}$

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

$r = -0.00012$

So

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

How old is the fossil?

This is t for which

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

So

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

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

$e^{-0.00012t} = 0.8$

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

$-0.00012t = \ln{0.8}$

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

$t = 1860$

The fossil is 1860 years old.

4 0

2 years ago

Determine whether the lines l1 and l2 given by the vector equations are parallel, perpendicular, or neither. L1: r(t) = (-2 + 4t

ss7ja [257]

Over which interval(s) is the function decreasing?

4 0

3 years ago

Which equation represents an exponential function that passes through the point (2, 36)?

Zepler [3.9K]

Answer: It would be the first equation because:

Step-by-step explanation:

In order to be an exponential function, the X

variable has to be in the exponent, that eliminates

the second and fourth answers

f(X) = 4(3)X

using the point (2,36)

f(2) = 4 (3)2

= 4 (9 )

= 36

6 0

2 years ago

Read 2 more answers