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2 years ago

What is the difference between five times a number and twice that number !??? Help asap!!

Mathematics

2 answers:

ladessa [460]2 years ago

7 0

When you times a number by two you times a number by two and you times a number by five

polet [3.4K]2 years ago

7 0

Answer:

5x-2x=3x

Step-by-step explanation:

You don't know what that number is. That's why you are using a variable. Difference is abviously subraction. Therefore, 5x-2x is equal to 3x

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3 years ago

Solve y+2/7<1/3. A y<13/21. B y>13/21. C y>-1/21. D y<1/21.

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2 years ago

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2 years ago

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In the drawing the base picture shows two squares on next to each other

The side picture shows three squares, one next to other and one above the square that right most.

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3 years ago

The length of a rectangle is 5 ft less than three times the width, and the area of the rectangle is 50 ft². Find the dimensions

Mariulka [41]

Answer

Length = 10 ft

Width = 5 ft

Explanation

Area of the rectangle given = 50 ft²

Let the width of the rectangle be x

So this means the length of the rectangle will be 3x - 5

What to find:

The dimensions of the rectangle.

Step-by-step solution:

Area of a rectangle = length x width

i.e A = L x W

Put A = 50, L = 3x - 5, W = x into the formula.

$\begin{gathered} 50=(3x-5)x \\ 50=3x^2-5x \\ 3x^2-5x-50=0 \end{gathered}$

The quadratic equation can now be solve using factorization method:

$\begin{gathered} 3x^2-5x-50=0 \\ 3x^2-15x+10x-50=0 \\ 3x(x-5)+10(x-5)=0 \\ (3x+10)(x-5)=0 \\ 3x+10=0\text{ }or\text{ }x-5=0 \\ 3x=-10\text{ }or\text{ }x=5 \\ x=-\frac{10}{3}\text{ }or\text{ }x=5 \end{gathered}$

Since the dimension can not be negative, hence the value of x will be = 5.

Therefore, the dimensions of the rectangle will be:

$\begin{gathered} Length=3x-5=3(5)-5=15-5=10\text{ }ft \\ \\ Width=x=5\text{ }ft \end{gathered}$

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9 months ago