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Lilit [14]
3 years ago
9

How many floor boards 2-1/4 inches wide are needed to cover a floor 15 feet wide

Mathematics
1 answer:
a_sh-v [17]3 years ago
3 0

Answer:

180 inches divide by 2.25 inches is 80

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What is the completely factored form of x4 8x2 – 9?
Alinara [238K]

For this case we have the following polynomial:

x ^ 4 + 8x ^ 2 - 9

We make the following change of variables:

u = x ^ 2

Rewriting we have

u ^ 2 + 8u - 9

Factoring the second order polynomial we have:

(u + 9) (u-1)

Then, returning the change we have:

(x ^ 2 + 9) (x ^ 2-1)

Finally, we factor the expression in the parentheses of the second term:

(x ^ 2 + 9) (x + 1) (x-1)

Answer:

the completely factored form is:

(x ^ 2 + 9) (x + 1) (x-1)

7 0
3 years ago
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Explain how you can use doubles when multiplying with 4 to find 4x8
STALIN [3.7K]
You can figure out what four times eight is by adding eight and eight(16) and doubling it (32)
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A projector enlarges an image in the ratio 20:1. What will be the size of an enlargement of a picture that is 8cm by 6cm?
nydimaria [60]

Answer:

160 cm × 120 cm

Step-by-step explanation:

this means 1 cm turns into 20 cm.

so, 8 cm × 6 cm becomes

8×20 = 160 cm × 6×20 = 120 cm

3 0
1 year ago
(-5.975)(16.59) muiltilpy
olga nikolaevna [1]

Answer:

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Step-by-step explanation:

4 0
3 years ago
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Find the perimeter of the figure to the nearest hundredth.​
WITCHER [35]
Perimeter: 36.84 feet

Let’s start with the easy part...all the rectangle pieces 6 x 3 = 18 feet

We know from subtracting the rectangle length (6ft) from the total length (12 ft) that the diameter of the circle is 6ft.

Circumference = diameter x pi
= 6 x 3.14 = 18.84

We have the circle split into 2 halves, but the circumference remains the same

18 + 18.84 = 36.84
6 0
3 years ago
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