3 years ago

28/n=7/9 help me with this

Mathematics

2 answers:

castortr0y [4]3 years ago

7 0

Answer:

n = 36

Step-by-step explanation:

$\frac{28}{n}$ = $\frac{7}{9}$

=> 28 x 9 = n x 7

=> 252 = 7n

=> n = 252 ÷ 7 = 36

mr Goodwill [35]3 years ago

3 0

Answer:

n= 36

Step-by-step explanation:

solve for n by cross multiplying

Hope this helped you :)

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What does x+x+x+x+x-1+1+1+1= ?<br><br> (Giving this for 30 points)

77julia77 [94]

First, let's add all the x's.

x + x + x + x + x = 5x

5x - 1 + 1 + 1 + 1

Now, let's add together all the 1's that are being added (not the 1 that is being subtracted from 5x).

1 + 1 + 1 = 3

5x - 1 + 3

3 - 1 = 2

5x + 2

There's no way you can actually solve this unless you know the value of x; without x's value, this is as simplified as the expression is going to get.

Hope this helps!

7 0

3 years ago

Read 2 more answers

Q.5(b) The population {(P) in millions} of a country is estimated by the function, P=125e0.035t, t = time measured in years sinc

nekit [7.7K]

Answer:

Hello,

Step-by-step explanation:

Q.5(b) The population {(P) in millions} of a country is estimated by the function, P=125e0.035t, t = time measured in years since 1990. (a) what is the population expected to equal in year 2000 (b) determine the expression for the instantaneous rate of change in the population (c) what is the instantaneous rate of change in the population expected to equal in year 2000.

$P(t)=125*e^{0.035*t}\\a)\\P(2000)=125*e^{0.035*(2000-1990)}=177.38...\\\\b)\\P'(t)=125*0.035*e^{0.035*t}\\\\c)\\\\P'(2000)=125*0.035*e^{0.035*(2000-1990)}=6.2084...$