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solong [7]
3 years ago
14

What answer to 7(v+9)-8(5-7)

Mathematics
2 answers:
ratelena [41]3 years ago
8 0

Distribute 7 to (v + 9) using PEMDAS, and use PEMDAS to solve -8(5-7).

7(v + 9) = 7v + 63

(5 - 7) = -2(-8) = 16

7v + 63 + 16

Simplify. Combine like terms

7v + 79

-----------------------------------------------------------------------------------------------------------------

7v + 79 is your answer

-----------------------------------------------------------------------------------------------------------------

hope this helps

postnew [5]3 years ago
7 0
Hope this helps u...!!

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Answer:

1/4.

Step-by-step explanation:

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a. The expression y=5x represent the number of small marbles she has.

b. The expression z=3x+2 represents the number of large marbles she has.

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Step-by-step explanation:

a. Let x represent the number of medium marbles Amy has. Write an algebraic expression to represent the number of small marbles she has.

Medium marbles = x

Let,

Small marbles = y

According to given statement;

She has five times as many small marbles as medium marbles.

y = 5x        Eqn 1

The expression y=5x represent the number of small marbles she has.

b. Write an algebraic expression to represent the number of large marbles she has.

Let,

Large marbles = z

The number of large marbles is two more than three times the number of medium marbles.

z = 3x+2        Eqn 2

The expression z=3x+2 represents the number of large marbles she has.

c. If Amy has a total of 560 marbles, how many of each size does she have?

x+y+z= 560     Eqn 3

Putting value of y and z from Eqn 1 and 2 in Eqn 3

x+(5x)+(3x+2)=560\\x+5x+3x+2=560\\9x=560-2\\9x=558

Dividing both sides by 9

\frac{9x}{9}=\frac{558}{9}\\x=62

Putting x=62 in Eqn 1

y=5(62)\\y=310

Putting x=62 in Eqn 2

z=3(62)+2\\z=186+2\\z=188

Amy has 310 small marbles, 62 medium marbles and  188 large marbles.

Keywords: linear equation, substitution method

Learn more about substitution method at:

  • brainly.com/question/11416224
  • brainly.com/question/11638377

#LearnwithBrainly

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Answer:

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