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Lubov Fominskaja [6]
3 years ago
6

If f(x) = 0.5(3 - x), what is the value of f(-3)? A: 3 B: 1.5 C: 0.5 D: 0

Mathematics
1 answer:
coldgirl [10]3 years ago
8 0
f(x)=0.5(3-x) \\ \\
f(-3)=0.5(3-(-3))=0.5(3+3)=0.5 \times 6=3 \\ \\
\boxed{f(-3)=3} \Leftarrow \hbox{answer A}
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What is the side length, in inches, of the pets
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Candy draws a square design with a side length of x inches for the window at the pet shop. She takes the design to the printer and asks for a sign that has an area of 16x2 – 40x + 25 square inches. What is the side length, in inches, of the pet shop sign?

Answer:

the length of the sign is 4x-5 inches

Step-by-step explanation:

Given

Area of the square of design = 16x^{2} -40x+25

First we find the roots of equation 16x^{2} -40x+25=0

The roots of the quadratic equation ax^{2} +bx^{2} +c=0 are given by

x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}

where a=16, b=-40, c=25

x=\frac{40\pm\sqrt{(-40)^2-4\times 16\times 25}}{2\times 16}

x=\frac{40\pm\sqrt{1600-1600}}{32}

x=\frac{40\pm\sqrt{0}}{32}

x=\frac{40}{32}

x=\frac{5}{4}

4x=5\\4x-5=0

That is, the factors of the polynomial 16x^{2} -40x+25 are 4x-5 and 4x-5.

So, Area of the square design = 16x^{2} -40x+25 = (4x-5)^{2}

Area of a square = Length^2

Thus, the length of the sign is 4x-5 inches

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Becky’s square living room needs new carpet. She needs about 200 square feet of carpet to cover the floor. What are the approxim
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I can’t figure this out could u help me
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Step-by-step explanation: hope this helped :)

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