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Gekata [30.6K]
2 years ago
5

How to solve 7x+(-3)=18​

Mathematics
2 answers:
liq [111]2 years ago
8 0

Answer:

x=3

Step-by-step explanation:

7x(-3)=18

add 3 to both sides

7x=21

divide by 7 on both sides

x=3

Leno4ka [110]2 years ago
7 0

Answer:

7x+(-3)=18

7x-3=18

7x-3+3=18+3

7x=18+3

7x=21

7x/7=21/7

x=21/7

x=3

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Which fraction does not belong with the other three explain 1/12 2/12 3/12 or 4/12
MakcuM [25]
1/12 does not belong with the other three fractions. 

2/12, 3/12, and 4/12 can all be simplified to 1/6, 1/4/, and 1/3. However, 1/12 can't be simplified.
6 0
3 years ago
In an insect colony there are 270 insects after 9 days. If there were initially 80 insects how long will it take the population
Semenov [28]

Answer:

The time it will take the population to grow to 800 insects is 17 days.

Step-by-step explanation:

The growth function of the insects is exponential.

The exponential growth function is:

y=a(1+r)^{t}

Here,

<em>y</em> = final value

<em>a</em> = initial value

<em>r</em> = growth rate

<em>t</em> = time taken

It is provided that there were 270 insects after 9 days and initially there were 80 insects.

Compute the value of <em>r</em> as follows:

y=a(1+r)^{t}\\\\270=80(1+r)^{9}\\\\3.375=(1+r)^{9}\\\\\ln(3.375)=9\cdot \ln(1+r)\\\\0.135155=\ln(1+r)\\\\1+r=1.14471\\\\r=0.145

Now, compute the time it will take the population to grow to 800 insects as follows:

800=80(1+0.145)^{t}\\\\10=(1.145)^{t}\\\\\ln(10)=t\cdot \ln(1.145)\\\\t=17.00522\\\\t\approx 17

Thus, the time it will take the population to grow to 800 insects is 17 days.

7 0
3 years ago
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fiasKO [112]
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To solve this problem using substitution, we need to set x equal to a value and substitute it into the other equation.

Since
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Now that we know y is -1, we can substitute it back into the equation to find x:

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Hope this helps!
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