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3 years ago

14

What is the discriminant of 9x2 + 2 = 10x?

2 answers:

Gwar [14]3 years ago

6 0

First get the equation into the form: Ax^2 + Bx + C = 0 (the quadratic equation).. We do this by subtracting 10x both sides (to get it on the other side).. 9x^2 + 2 = 10x 9x^2 - 10x + 2 = 10x - 10x 9x^2 - 10x + 2 = 0 Now the discriminant is: b^2 - 4ac The quadratic equation is Ax^2 + Bx + C = 0 Here, A = 9, B = -10 and C = 2 so plug them in... (-10)^2 - 4 (9)(2) = 100 - 4 (18) = 100 - 72 = 28 <--- answer...

DerKrebs [107]3 years ago

3 0

Answer:

28

Step-by-step explanation:

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2 years ago

Give the unit rate for the better deal.<br><br> $81<br> 25 gal<br> or <br> $62.05<br> 20 gal

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Answer:

$62.05 for 20 gallons

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Step-by-step explanation:

$81 for 25 gallons =

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$62.05 for 20 gallons =

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3 years ago

All 150 eighth grade students at a local middle school were asked how many hours they studied during the week. Each row of the t

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Answer:

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Step-by-step explanation:

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Row 1:

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Row 2:

(4+5+3+5+6)/5 = 23/5 = 4.6

Row 3:

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Row 4:

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Richard’s store sells pineapples and grapefruits. Pineapples originally cost $5.15 apiece, and grapefruits originally cost $2.25

sveta [45]

Answer:

c. The price of grapefruits experienced a reduction 6.01 percentage points greater than the price of pineapples.

Step-by-step explanation:

The original price of Pineapples=$5.15

New price of Pineapples=$3.88

<u>Find change in price of Pineapples</u>

Change in price=original price- new price

$=5.15-3.88=1.27$

The price of Pineapple was reduced by $1.27

<u>% reduction in price</u>

(reduction value/original value) × 100

$=\frac{1.27}{5.15} *100=24.66$

=24.66%

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New price of grape fruits=$1.56

<u>Change in price of grape fruit</u>

Change in price= original price -new price

$=2.25-1.56=0.69$

<u>% reduction in price of grape fruits</u>

(reduction value/original value)×100

$=\frac{0.69}{2.25} *100=30.67$

=30.67%

<u>Answers</u>

The fruit that has its price reduced by a greater percentage is grape fruit

How many percentage points greater = 30.67%-24.66% = 6.01 points

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