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olga_2 [115]
4 years ago
12

I need HELLLPPPPP. A student bought concert tickets online. The total cost, c, in dollars, of t tickets can be

Mathematics
1 answer:
oksian1 [2.3K]4 years ago
8 0

Answer:

The answer is 9.

Step-by-step explanation: Things to know: c is total cost and t tickets. 800 is the total cost so plug it in to c. You want to get t (tickets) alone.

original: c(t)=87.50t+12.50

Now with the 800: 800=87.50t+12.50

Subtract 12.50 to both sides: 787.5=87.50t

Divide 87.50 to both sides: 9=t

Hopefully this helped. :]

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16x²-81=0 solve the following quadratic equation
arsen [322]
16x^2-81=0\\\\(4x)^2-9^2=0\\\\(4x-9)(4x+9)=0\iff4x-9=0\ \vee\ 4x+9=0\\\\4x=9\ \vee\ 4x=-9\\\\x=\frac{9}{4}\ \vee\ x=-\frac{9}{4}


or\\\\16x^2-81=0\\\\16x^2=81\ \ \ \ /:16\\\\x^2=\frac{81}{16}\\\\x=\pm\sqrt\frac{81}{16}\\\\x=-\frac{\sqrt{81}}{\sqrt{16}}\ \vee\ x=\frac{\sqrt{81}}{\sqrt{16}}\\\\x=-\frac{9}{4}\ \vee\ x=\frac{9}{4}
7 0
3 years ago
Read 2 more answers
Use the fact that the world population was 2560 million in 1950 and 3040 million in 1960 to model the population of the world in
zimovet [89]

Answer:

The populaton in year 1991 will be of 5178.9 million of people

and the population in year 2020 will be of 8524.60 million of people

Step-by-step explanation:

We measure the time t in years and let t=0 in the year 1950.

We measure the population P(t) in millions of people, then P(0)=2560 and P(10) = 3040.

Since we are assuming that dp/dt=kP, this theorem gives the following.

P(t) = P(0)e^{kt}= 2560e^{kt}

P(10) = 2560 e^{10k} = 3040

k=\frac{1}{10} ln (3040/2560) = 0.0171

The relative growth rate is about 1.7% per year and the model is

P(t) = 2560e^{0.017185t}

<em>Year 1991 is equal in our formula to 41 and year 2020 is equal to 70. </em>Replacing,

P(41) = 2560e^{0.017185(41)}=5178.89

P(70) = 2560e^{0.017185(70)}=8524.60

Therefore the populaton in year 1991 will be of 5178.9 million of people and the population in year 2020 will be of 8524.60 million of people

6 0
3 years ago
last year ,Linda opened an investment account with &amp;7800. At the end of the year ,the amount in the account had decreased by
torisob [31]
Ummm...I think 40.45% don't trust me cause this is not correct
3 0
4 years ago
in a fireplace, about 3/4 of an 18-inch log will burn in 1/3 of an hour. How many hours will it take to burn 2 1/2 logs?
olga_2 [115]
3/4 =1/3 hour
how long to burn 2 and 1/2

3/4=1/3hour
1/4=1/9 hour
4/4=1=4/9hour
1/2=2/4
1/2=2/9hour
 
2 and 1/2=1+1+1/2=4/9+4/9+2/9=10/9=9/9+1/9=1+1/9=1 and 1/9



answer is C. 1 and 1/9 hour
3 0
4 years ago
Sylvie is 3 years older than twice edders age if sylvie is 27 years old how old is edder
Mama L [17]
Edder is 12
2x+3=27
-3
2x=24
/2
x=12
3 0
3 years ago
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