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2 years ago

The sum of 3 rational numbers is 90 determine these 3 numbers

Mathematics

2 answers:

MAXImum [283]2 years ago

7 0

3x+3=90

3x=90-3

3x=87

x= 29

three no are 29 ,30 ,31

harina [27]2 years ago

5 0

Answer:

Step-by-step explanation:

please mark me as brainlist

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Alecsey [184]

I'd say it's D. I know the effect is that the money is increased, however I don't know by exactly how much.

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4 years ago

Got a calc 1 question,

belka [17]

$v=\dfrac h{3x}\implies\dfrac{\mathrm dv}{\mathrm dt}=\dfrac{3x\frac{\mathrm dh}{\mathrm dt}-3h\frac{\mathrm dx}{\mathrm dt}}{3x^2}$

By the chain rule,

$\dfrac{\mathrm dh}{\mathrm dt}=\dfrac{\mathrm dh}{\mathrm dx}\dfrac{\mathrm dx}{\mathrm dt}$

We have

$h(x)=4e^{2x-6}-x^2+5\implies\dfrac{\mathrm dh}{\mathrm dx}=8e^{2x-6}-2x$

and we're given that $x$ changes at a constant rate of $\frac{\mathrm dx}{\mathrm dt}=0.2$ thousand people per minute, which means

$\dfrac{\mathrm dv}{\mathrm dt}=\dfrac{3x\left(8e^{2x-6}-2x\right)\left(0.2\frac{\text{thousand people}}{\rm min}\right)-3h\left(0.2\frac{\text{thousand people}}{\rm min}\right)}{3x^2}$

At the moment $x=4$ thousand people are in the park, we have $h(4)=4e^2-11$ , so we find

$\dfrac{\mathrm dv}{\mathrm dt}=\dfrac{12\left(8e^2-8\right)-3(4e^2-11)}{240}\dfrac{\text{thousand people}}{\rm min}=\dfrac{7(4e^2-3)}{80}\dfrac{\text{thousand people}}{\rm min}$

or approximately 2.324 thousand people per minute.

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4 years ago

A high-speed elevator can rise 360 feet in 20 seconds. Which expression represents the rate, in feet per second, of the elevator

sleet_krkn [62]

Answer:

360/20

Step-by-step explanation:

20 sec = 360 feet

feet per second means how many feet for every 1 second so

1 sec = 360/20 feet

If you like to venture further, feel free to check out my insta (learntionary). I'll be constantly posting math tips and notes! Thanks!

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3 years ago

9TH GRADE MATH. PLEASE HELP. PLEASE.

Mumz [18]

Answer:

Step-by-step explanation:

x3 to x4 rate of change is 8

x4 to x5 rate of change is 16

8+16 is 24 divided by 2 to fond the average and u get 12

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3 years ago

Find the value of the expression 2x^3+3y^2-17 when x=3 and y=4.

Crank

2x^3+3y^2-17 if x=3 and y=4, so we have this:
2(3)^3+3(4)^2-17
First step, I will do the exponent first.
(3)^3=27
(4)^2=16, so
2(27)+3(16)-17
=54+48-17
=102-17
=85. Hope it help!

8 0

4 years ago