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Mathematics

1 answer:

DochEvi [55]2 years ago

8 0

Answer:

see explanation

Step-by-step explanation:

$\sqrt[3]{27}$ = 3

Since 3 × 3 × 3 = 27

$\sqrt{25}$ = ± 5

Since 5 × 5 = 25 and - 5 × - 5 = 25

$\sqrt{81}$ = ± 9

Since 9 × 9 = 81 and - 9 × - 9 = 81

$\sqrt[3]{1}$ = 1

Since 1 × 1 × 1 = 1

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Which two fractions have a sum of −7/30 ? Drag and drop the appropriate fraction into each box.

Brrunno [24]

Well you will need two number that are divisible by 30 and add up to -7 so they will have to be a negative.

I would try -2 and -5 which are both divisible by 30 and ad up to -7 so...

-2/30 + -5/30 = -7/30

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3 years ago

If x>2,then x2-x-6/x2-4=

statuscvo [17]

$\frac{x^2-x-6}{x^2-4}=(*)\\------------\\x^2-x-6=0\\a=1;\ b=-1;\ c=-6\\\Delta=b^2-4ac;\ \Delta=(-1)^2-4\cdot1\cdot(-6)=1+24=25\\\\x_1=\frac{-b-\sqrt\Delta}{2a};\ x_2=\frac{-b+\sqrt\Delta}{2a}\\\\x_1=\frac{1-\sqrt{25}}{2\cdot1}=\frac{1-5}{2}=\frac{-4}{2}=-2\\\\x_2=\frac{1+\sqrt{25}}{2\cdot1}=\frac{1+5}{2}=\frac{6}{2}=3\\\\x^2-x-6=(x+2)(x-3)$
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6 0

3 years ago

Solve for x.<br> 21x + 11 - 5 = 5

Reil [10]

Answer:

x= -1/21

Step-by-step explanation:

21x + 11 - 5 = 5

21x + 6 = 5

(-6 each side)

21x = -1

(divide 21 each side)