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3 years ago

Use the following coefficients of a quadratic equation:

1 answer:

4 0

Hello:
<span> the quadratic equation is : 2x²+4x-6 = 0
delta = b²-4ac
delta = 4²-4(2)(-6) =64 = 8²
x =(-4+</span><span>√64) /4 =(-4+8)/4 = 1
or </span>x =(-4-√64) /4 =(-4-8)/4 = -3

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What is 3 1/4 divided by 2/3 with all of the steps?

erik [133]

Answer:

4 7/8

Step-by-step explanation:

3 1/4 / 2/3

convert mixed numbers to improper fractions: 3 1/4 / 2/3

13/4 / 2/3

apply the fraction rule: a/b / c/d = a/b * d/c

= 13/4 * 3/2

multiply fractions: a/b * c/d = (a * c)/(b * d)

= (13 * 3)/(4 * 2)

multiply the numbers: 13 * 3 = 39

= 39/(4 * 2)

multiply the numbers: 4 * 2 = 8

= 39/8

convert improper fractions to mixed numbers: 39/8 = 4 7/8

= 4 7/8

5 0

3 years ago

7,3,5,6 using each number only once equal 75 using parentheses

Kaylis [27]

[ (3 · 7) - 6 ] · 5 = [ 21 - 6 ] · 5 = 15 · 5 = 75

5 0

3 years ago

How many ways can a dance instructor send 4 of her 11 students to a summer dance program?

Sedaia [141]

Answer:

d) 330

Step-by-step explanation:

The number of ways can a dance instructor send 4 of her 11 students to summer dance program is C(11 , 4)

That is $11_{C_{4} }$ ways

by using formula $n_{C_{r} } = \frac{n!}{(n-r)!r!}$

now simplification

$11_{C_{4} } = \frac{11!}{(11-4)!4!}$

= $\frac{11X10X9X8X7!}{(7!)4X3X2X1}$

after cancelling 7! and on simplification

= $\frac{11X10X9X8}{4X3X2X1}$

after cancellation we get 330 ways

The number of ways can a dance instructor send 4 of her 11 students to summer dance program is 330

8 0

2 years ago

5 The Young family is replacing their central air-conditioning with a high- efficiency unit that costs $11798. The family is off

kari74 [83]

Answer:

12742.84$

Step-by-step explanation:

11798 (the price) + 11796 x 0.08 (8% interest)=12742.84

6 0

2 years ago

Which side lengths form a right triangle?

mr Goodwill [35]

B: 8,15,17

These lengths forms a

right angle triangle.

4 0

2 years ago