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2 years ago

Use the working backward method to find the solution of the equation.

Mathematics

2 answers:

shusha [124]2 years ago

4 0

Y=2 explanation because -1 on both sides divide both sides by 7

Dahasolnce [82]2 years ago

3 0

Answer:

y=2

Step-by-step explanation:

7y-1=13

+1 +1

7y=14

/7 /7

y=2

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A bagback that normally sales $39 is on sale for 30% off.Find the amount of the sale price

Ede4ka [16]

If the sale price is 30%, you turn that into a decimal and it will be .3. now you multiply the discount by 39 and it will get you 11.7. 11.7 is the money of discount so now all you have to do is subtract 11.7 from 39 and you shall get 27.3.

7 0

3 years ago

Plsssss helpppp!!!!!

Natali5045456 [20]

Answer:

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Step-by-step explanation:

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3 years ago

5/6+2 3/4 (it is a faction)

frosja888 [35]

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Step-by-step explanation:

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3 years ago

Nevaeh rolls a standard six-sided die, numbered from 1 to 6. Which word or phrase

liubo4ka [24]

Answer:

Step-by-step explanation:

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To get a seven with just 1 die is impossible.

7 0

3 years ago

The population of a city grows exponentially at rate of 8% per year.Find the number of years it takes for the population to be d

Ilya [14]

Answer:

<em>It will take 9 years for the population to double</em>

Step-by-step explanation:

<u>Exponential Growth </u>

The natural growth of some magnitudes can be modeled by the equation:

$P=P_o(1+r)^t$

Where P is the actual amount of the magnitude, Po is its initial amount, r is the growth rate and t is the time.

The population of a city grows at a rate of r=8% = 0.08 per year. We are required to find when (t) the population will double, or P=2Po.

Substituting in the equation:

$2P_o=P_o(1+0.08)^t$

Simplifying:

$2=(1.08)^t$

Taking logarithms:

$\log 2=\log (1.08)^t$

Applying the exponent property of logs:

$\log 2=t\log (1.08)$

Solving for t:

$\displaystyle t=\frac{\log 2}{\log (1.08)}$

Calculating:

$t\approx 9$

It will take 9 years for the population to double

8 0

3 years ago