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2 years ago

13

Evaluating expressions. Someone please help

2 answers:

larisa86 [58]2 years ago

6 0

What is your level at school? I want to help you through the answers

Sholpan [36]2 years ago

3 0

Super easy so what your going to do is replace x with 5 and y with 3 (it says in the directions) for example number 1 3x-2y+4 so replace the variables with numbers so when there is a number next to a letter that means to multiply so 3x5-2x3+4 then you just solve and remember pemdas and when there bit two variables next to each other multiply hope this helps

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sineoko [7]

Answer:

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Step-by-step explanation:

By adding a variable you can set up an addition sentence

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2 years ago

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2 years ago

Read 2 more answers

A rectangle has a length that is three feet more than twice it’s width. If the area of the rectangle is 90 square feet, then alg

Mkey [24]

Answer:

$Length=27feet\\Width=12 feet$

Step-by-step explanation:

Let, the length of the rectangle be 'L'

and, width of the rectangle be 'W'

length=2*Width+3

$L=(2W+3) feet\\\\$

Area of the rectangle= 90 square feet

Area of a rectangle = Length*Width

$90=(2W+3)*W\\\\2W^2+3W=90\\\\2W^2+3W-90=0\\\\$

Using Factorization Method to solve quadratic equation:

$2W^2-12W+15W-90=0$

Taking common from the equation:

$2W(W-12)+15(W-12)=90\\\\(W-12)(2W+15)=0\\\\W-12=0\\\\W=12 feet$

OR

$2W+15=0\\\\2W=-15\\\\W=-7.5 feet$

The Width cannot be negative, therefore Width(W)=12 feet

$Length=2*Width+3\\\\=(12*2)+3\\\\=24+3\\\\=27 feet$

$Length=27feet\\Width=12 feet$

3 0

2 years ago

Jordan wrote the following description. Three fewer than one fourth of x is 12. Write an equation to represent the description??

VMariaS [17]

Answer:

1/4x - 3 = 12

Step-by-step explanation:

When it says "three fewer," it means subtract three from one fourth of x. "Is" always means the equal sign. Knowing this, we get the equation:

1/4x - 3 = 12

8 0

2 years ago