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4 years ago

I'm stuck :( PS It's worth 100 points!

Mathematics

2 answers:

hjlf4 years ago

4 0

You just gotta plug in those numbers, so:

A=a+b/2*h

40=(x+3)+x /2 * 2x

daser333 [38]4 years ago

3 0

The area of a trapezoid is (b1+b2)/2 times height
So if we plug in our values it will be
(x+x+3)/2 times 2x
Simplify
(2x+3)2 times 2x
(4x^2+6x)/2
And finally we simplify down to 2x^2+3x
Now we know that this equals 40, so...
2x^2+3x=40
Put the 40 on the other side
2x^2+3x-40=0
Now find the positive zero which is 3.785
Add 3 because we are looking for the long base and get 6.785
round it to nearest tenth and get 6.8
Do you get it?

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Identify the property used in Step 3.

svp [43]

The associative property has been used in step 3

Step-by-step explanation:

There are multiple properties that are used to solve the equations

One of them is associative property.

Associative property states that the order of three terms which are being added doesn't matter the result will be same.

$a + (b+c) = (a+b)+c$

In step 2:

$2 + 2x + 10 + (-10 + 11x)$

As we can see that the last three terms are being added

The solver has used the associative property to solve the expression.

$2 + 2x + [10 + (-10)] + 11x$

The brackets have been changed from $10+(-10+11x)\ to\ [10 + (-10)} +11x$ using associative property

The associative property has been used in step 3

Keywords: Properties , expressions

Learn more about expressions at:

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5 0

3 years ago

4x - 12 = 36 * pls helppppppppppppppppp

xenn [34]

X=12

36 + 12 = 48

48/4 = 12

6 0

3 years ago

Solve the equation. 1. -66 = -9n+ 16 + 4 n = 4 b. n = 10

prisoha [69]

Answer:

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

One number is 3 times a first number. A third number is 100 more than the first number. If the sum of the three numbers is 500,

Likurg_2 [28]

Let the first number be x.
Then the second number is 3x.
Then the third number is (x+100).
Sum of the numbers=500

x+3x+(x+100)=500
4x+(x+100)-500=0
5x=400
x=80
The first number is 80.
The second number is 240.
The third number is 180.

We can check by adding all three of those numbers together: 80+240+180 = 500

Hope this helps! If you have any questions just ask!

8 0

3 years ago

If the flour to sugar ratio is 5 cups flour to 1 cup sugar, then how much sugar is needed if only 2 cups of flour are used? (Giv

REY [17]

5 flour / 1 sugar = 2 flour / X sugar;

X = (2 * 1) / 5 = 2/5 cup

6 0

4 years ago