Which expression is equivalent to x + y + x + y + 3(y + 5)? 2x + 5y + 5 2x + y + 30 2x + 5y + 15 2x + 3y + 10

 $x + y + x + y + 3(y + 5)= \\ \\ x+y+x+y+3y+15= \boxed{ 2x+5y+15 }$

7 0

2 years ago

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Y varies directly with the square x. If y= 27 when x = 3, find y when x = -4

Lana71 [14]

Answer:

y~x²

y/x²= k

27/3²=3

therefore k= 3

y/ -4 = k

y / -4= 3

3y = -4

y = -4

6 0

2 years ago

What is 15.36x(-0.45)

lord [1]

Simplifying 15.36x[-0.45] = 0 Reorder the terms for easier multiplication: 15.36 * -0.45x = 0 Multiply 15.36 * -0.45 -6.912x = 0 Solving -6.912x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '-6.912'. x = 0 Simplifying x = 0

5 0

2 years ago

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Red and grey bricks were used to build a decorative wall. The number of red bricks/number of grey bricks was 5/2. There were 140

Airida [17]

To find the number of red bricks used, you can create a part to part to whole ratio from the simple ratio of red to grey brick they give.

Then, use the total to create an equivalent ratio with the actual total number of bricks (140).

5 red 100 red
2 grey = 40 grey
7 total 140 total

Each time, the simple ratio was multiplied by 20 to get the actual totals for each color.

There were 100 red bricks used.

6 0

2 years ago