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horrorfan [7]
2 years ago
6

A student claims that the expression “9 times the sum of a number and 13” is translated to the algebraic expression 9n + 13. Is

the student correct? If not, what is the correct expression?
Mathematics
2 answers:
Alex73 [517]2 years ago
8 0
9*13+n 
I think that is correct, try and split up the question. 
9* 
A sum of a number AND 13
So that means that 9 is multiplying by the SUM (adding) of 13 and a number (n)
8_murik_8 [283]2 years ago
4 0
9*13+n 

9* 
<span>A sum of a number and 13

so your answer is correct.</span>
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The population of a particular city is given by the function P(t) = 27,400(1.07)t, where t is the time in years and P(t) is the
otez555 [7]

Answer:

27,400 is the current population

7% is the rate of increase

The new size is:

  • 38,430 is the population if t is an exponent
  • 146,590 is t is NOT an exponent in the formula you typed

Step-by-step explanation:

To find the population in a future year, use the formula:

P(t) = 27,400(1.07)t

Substitute the value t=5 to find the population in 5 years.

P(t) = 27,400(1.07)t\\P(t) = 27,400(1.07)(5)\\P(t) = 146,590


Or if the equation is supposed to have t as an exponent then look below:

P(t) = 27,400(1.07)^t

Substitute the value t=5 to find the population in 5 years.

P(t) = 27,400(1.07)^t\\P(t) = 27,400(1.07)^(5)\\P(t) = 38,430

This formula is based off the standard formula A=A_0(1+r)^t so r, the rate is 1.07=1+0.07 so r is 7%.

A_0 is the starting population which is 27,400 here.

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2 years ago
marta and debbie each have 17 ribbons. they buy 1 package with 8 ribbons in it. how many ribbons do they have now?
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Fittoniya [83]

Answer:

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filling the jug up half way adds 1.4 kg to the weight.

2 x 1.4 - 2.8 kg of marbles when full

4-2.8 = 1.2 kg

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