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3 years ago

7

A random sample of dry erase board marker at Juan school show that 9 of the 60 dry erase board markers do not work.There are 200

dry erase board marker at Juan school

1 answer:

Nikolay [14]3 years ago

5 0

Around 30 don’t work

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Determine the type and number of solutions of 4x^2-5x+1=0.

Arlecino [84]

<span>4x² - 5x + 1 = 0
a = 4; b = - 5, c = 1
</span>Δ = b² - 4.a.c
Δ = (-5)² - 4.4.1
Δ = 25 - 16
Δ = 9
<span>
x = - b </span>± √Δ / 2.a
$x = \frac{-5\± \sqrt{9} }{2*4}$
$x = \frac{-5\±3}{8}$
$x' = \frac{-5-3}{8} = \frac{-8}{8} = -1$
$x' = \frac{-5+3}{8} = \frac{-2}{8} (\div2) = \frac{-1}{4}$

A. Two real solutions (x' = -1 and x'' = -1/4)

4 0

3 years ago

A rectangular prism has a length of 12 inches, a width of 5 inches, and a height of 4 1/4 inches.

Darya [45]

Answer:

130.56

Step-by-step explanation:

Volume of the prism is 12×5×4.25=255 in³

Volume of the cubes are 1.25³=1.953125 in³

255/1.953125 = 130.56 in³

brainliest plz

5 0

3 years ago

The line segment shown is rotated 90° clockwise about the origin. What are the new coordinates of point B?

Monica [59]

I’m pretty sure the answers is B

6 0

3 years ago

Please Help!!!..............................

Karo-lina-s [1.5K]

Answer:

The first choice.

Step-by-step explanation:

Your graph should look like one below.

5 0

3 years ago

7. Sarah bought a lawnmower for $320. She signed up for the buy now pay later plan at the store with the following conditions: $

erastova [34]

Amount financed
320−100=220

Total paid
100+25×12=400

Interest paid
400−320=80

Interest rate=(2yc)÷(m (n+1))
I=(2×12×80)÷(220 (12+1))
I=(2×12×80)÷(220×13)
I=0.67×100
I=67%

4 0

3 years ago

Read 2 more answers