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3 years ago

If we need exactly 2,000 pieces of 3.5" in length, how many 8' boards are needed for 2,000 pieces?

Mathematics

1 answer:

Kaylis [27]3 years ago

7 0

Total length of boards needed = 2000*3.5 = 7,000.

Total number of 8' boards needed = 7000/8 = 875 answer

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I dont understand please help

DiKsa [7]

$2 \frac{1}{2}+(-2\frac{1}{4})$

This is equal to:

$2\frac{1}{2}-2\frac{1}{4}$

When you add a negative number, it turns into subtraction.

First, I would change it to mixed numbers:

$\frac{5}{2}-\frac{9}{4}$

Now, you need to change the denominators to make sure they are the same on both fractions. I changed the first fraction's denominator to 4 so they match. You can do this by multiplying the numerator by 2:

$\frac{10}{4}-\frac{9}{4}$

Now, you simply subtract:

10-9=1

1/4 is your answer.

I hope this helps :)

3 0

3 years ago

Natalia and Riley hike 10 6/11 miles. In one day, Ricardo hiked to 2 3/4 times as far as Natalia and Riley hiked. how far did he

Maksim231197 [3]

Answer:

Ricardo hiked 29 miles.

Step-by-step explanation:

10 6/11 x 2 3/4

convert

116/11 x 11/4 = 1276/44

1276/44 = 29

7 0

2 years ago

A DEF has vertices D(-5,-1), E (3, 3), and F (1,-5). Find the equation of the altitude through F in

Tems11 [23]

Answer:

y = -2x -3

Step-by-step explanation:

- the altitude trough F is a perpendicular line to the line DE

- find slope of line DE

D ( x2 = -5, y2 = -1); E (x1 = 3, y1 = 3)

slope m = (y2-y1) / (x2-x1) = (-1-3) / (-5-3) = -4/ -8 = 1/2

-find equation of the altitude trough F

lines that are perpendicular have the slope negative reciprocal (negative reciprocal of 1/2 is -2)

y= -2x +b , for point F(1, -5)

-5 = -2*1 +b, add 2 to both sides

-5 +2 = b, combine like terms

-3 =b

equation of the altitude trough F is y = -2x -3

4 0

2 years ago

A^4 + 2b OVER a; if a =3 and b = 12

Tems11 [23]

Answer:

105

Step-by-step explanation:

Given : a = 3, b = 12

3 ⁴ = 81

2 x 12 = 24

Result:

81 + 24

= 105

6 0

3 years ago

Arithmetic mean of marks (out of 25) scored by 10 students was 15. One of the student, named Karishma enquired the other 9 stude

erastova [34]

Answer:

Krishna's marks x marks

so...

xˉ=15

xˉ=15n=10

xˉ=15n=10∑x=x+x−8+x−6+x−3+x−1+x+x+2+x+3+x+4+x+6=10x−3

15=10x-3/10

150+3=10x

x=150/10=15.3 marks

Krishna scored 15.3 marks.

hope it helps you sis...

3 0

2 years ago