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3 years ago

5(3r+11)=85

Mathematics

2 answers:

raketka [301]3 years ago

5 0

Answer:

r = 2

Step-by-step explanation:

Actually, there are 2 ways to solve this equation.

The first one:

5( 3r + 11) = 85

so here, you have to multiply 5 by ( 3r + 11) and maintain the 85

15r + 55 = 85... now put the like terms together. In other words, just transpose 55 to the other side. 

15r = 85 -55..... remember that the sign of 55 will change from positive to negative 

15r = 30.... now divide both sides by 15

15r/15 = 30/15

 r = 2

The second method :

5 ( 3r + 11) = 85...... divide both sides by 5

5 (3r + 11) / 5 = 85/5

3r + 11 = 17

3 r = 17 - 11

3r = 6 

r = 2

I hope this helps. If you don't quite get it, please go through until you get it. Have a nice day :-)

viktelen [127]3 years ago

3 0

Answer:

r = 2

Step-by-step explanation:

5(3r + 11) = 85

~Use distributive property

15r + 55 = 85

~Subtract 55 to both sides

15r = 30

~Divide 15 to both sides

r = 2

Best of Luck!

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