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g100num [7]
3 years ago
5

A person's email for one day contained a total of 78 messages. The number of spam

Mathematics
1 answer:
andriy [413]3 years ago
8 0

Answer:

62 of the email messages were spam

Step-by-step explanation:

Let the number of spam and other messages be s and o respectively.

Total number of messages= 78

s +o= 78 -----(1)

s= 4o -2 -----(2)

Substitute (2) into (1):

4o -2 +o= 78

<em>Simplify:</em>

5o -2= 78

<em>+</em><em>2</em><em> </em><em>on </em><em>both </em><em>sides:</em>

5o= 78 +2

5o= 80

<em>Divide </em><em>both </em><em>sides </em><em>by </em><em>5</em><em>:</em>

o= 80 ÷5

o= 16

Since s +o= 78, s= 78 -o.

s= 78 -16

s= 62

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Answer this question thanks:)
Viefleur [7K]

First multiply 2 to both sides to isolate q. Since 2 is being divided by q, multiplication (the opposite of division) will cancel 2 out (in this case it will make 2 one) from the left side and bring it over to the right side.

\frac{q}{2} × 2 < 2 × 2

q < 4

For the graph will you have a empty or colored in circle?

If the symbol is ≥ or ≤ then the circle will be colored in. This represents that the number the circle is on is included.

If the symbol is > or < then the circle will be empty. This represents that the number the circle is on is NOT included.

Which direction will the ray go?

If the variable is LESS then the number then the arrow will go to the left of the circle.

If the variable is MORE then the number then the arrow will go to the right of the circle.

In this case your inequality is:

q < 4

aka q is less then four

This means that the graph will have an empty circle and the arrow will go to the left of 4. (look at image below)

Hope this helped!

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8 0
3 years ago
Read 2 more answers
Translate this phrase into an algebraic expression.
IrinaK [193]

Answer:

49 - 2y

Step-by-step explanation:

y to represent Vanessa's age.

49 decreased by twice Vanessa's age

decreased by means subtract, twice means 2 times

49 - 2y

4 0
3 years ago
Please someone help with this
Sholpan [36]
A=16 and b=63

So we have to use the Pythagoras theorem for this and that is:
a^2+ b^2 = c^2

And we want to find c , which is the long side of the triangle so..

16^2+ 63^2= 4225
So c^2 =4225

c= square root of 4225
C= 65
4 0
4 years ago
How do i write 720,080 in expanded form with exponents
max2010maxim [7]
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4 0
3 years ago
3x+5y= 10?<br><br> A. y =⅗ x+ 10 <br> B. y = 3x− 2 <br> C. y =- ⅗ x +15<br> D. y = − 5/3 x - 8
Andrews [41]
It a or c take a guess
8 0
3 years ago
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