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3 years ago

Multiply and simplify: sq rt 7x ((sq rt x)-7sq rt. 7)

Mathematics

2 answers:

Dmitriy789 [7]3 years ago

5 0

Answer:

7x(√x - 7√7) Multiply √7x to "√x" and "-7√7" respectively:

√7x*√x - 7√7*√7x

First is to simplify: √7x² - 7√7²x

Extract the squares: x√7 - 7*7√x

Then, we simplify: x√7 - 49√x

After simplifying the equation, I got the answer x√7 - 49√x.

Step-by-step explanation:

jarptica [38.1K]3 years ago

3 0

7x(√x - 7√7) Multiply √7x to "√x" and "-7√7" respectively:
√7x*√x - 7√7*√7x
First is to simplify: √7x² - 7√7²x
Extract the squares: x√7 - 7*7√x

Then, we simplify: x√7 - 49√x
After simplifying the equation, I got the answer x√7 - 49√x.

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3 years ago

A couple needs $55,000 as a down payment for a home. If they invest the $40,000 they have at 4% compounded quarterly, how long w

slava [35]

Answer:

8 years

Step-by-step explanation:

Compound interest formula

$A(t)= A_0(1+\frac{r}{n})^{nt}$

A(t) is the final amount 55000

A_0= 40000, r= 4% = 0.04, for quarterly n=4

$55000=40000(1+\frac{0.04}{4})^{4t}$

divide both sides by 40000

$1375=(1+\frac{0.04}{4})^{4t}$

$1375=(1.01)^{4t}$

Take ln on both sides

$ln(1375)=4tln(1.01)$

divide both sides by ln(1.01)

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Divide both sides by 4

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8 0

3 years ago

if a store is offering 20% discount on all items. is there a proportional relationship between the original price of an item and

Novosadov [1.4K]

Answer:

A store is offering a 14% discount on all items. Write an equation relating the sale price S for an item to its list price L.

Step-by-step explanation:

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3 years ago

Which expression is equivalent to (3x-6)(4x+1)

vodka [1.7K]

Answer:

12x^2 -21x -6

Step-by-step explanation:

(3x-6)(4x+1)

FOIL

first 3x*4x= 12x^2

outer 3x*1 = 3x

inner -6*4x = -24x

last -6*1 = -6

Add them together

12x^2 +3x -24x -6

Combine like terms

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3 years ago

Peter learns the following: A cheetah travels about 0.15 kilometers in 5 seconds. A snail travels about 1.5 centimeters in 5 sec

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Cheetah travels 0.15 km in .....................5 seconds or
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the cheetah travels in 5 seconds 15000-1.5=14998.50 cm which is equal to
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3 years ago