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3 years ago

Can someone help mewith this

Mathematics

2 answers:

Vsevolod [243]3 years ago

6 0

Answer:

(x+3)(x-3) * 2

4 (x-3) (x+3)

= 1/2

Alona [7]3 years ago

3 0

Answer:

1/2

Step-by-step explanation:

$\frac{(x-3) * (x+3) }{2(2x-6)}$ × $\frac{2}{x+3}$

$\frac{(x-3)*1}{2(x-3)}$

$\frac{1}{2}$

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What is the value of x + 3y + z if x = 4, y = 5, and z= 22 a) 16 b) 41 c) 2

fgiga [73]

Answer:

OPTION B - 41

Step-by-step explanation:

An expression is given and the corresponding values for the expression are also given. We have to substitute the given values to arrive at the answer.

The given expression is: x + 3y + z.

Also given: x = 4, y = 5, z = 22.

Substitute these values in the above expression, we get:

4 + 3(5) + 22 = 4 + 15 + 22 = 41.

∴ x + 3y + z = 41

3 0

2 years ago

Please help!! I’m stuck on this

beks73 [17]

Answer:

B. $x = -4\,\lor \,x = -1$

Step-by-step explanation:

Let $\sqrt{-4-5\cdot x} = x$ , we solve for $x$ by algebraic means.

1) $\sqrt{-4-5\cdot x} = x$ Given

2) $-4-5\cdot x = x^{2}$ Definition of power/Symmetry of equality

3) $x^{2}+5\cdot x + 4 = 0$ Compatibility with addition/Commutative and associative properties/Existence of additive inverse/Modulative property

4) $(x+4)\cdot (x+1) = 0$ $x^{2}+(a+b)\cdot x +a\cdot b = (x + a)\cdot (x+b)$

5) $x = -4\,\lor \,x = -1$ Result

Hence, the correct answer is B.

7 0

2 years ago

A rectangle has vertices at A(4,1), B(1,1), C(1,-6), and D(4,-6). What is the area of the rectangle?

slamgirl [31]

using the given coordinates, the rectangle is 7 by 3 units

area = 7*3 = 21 square units

8 0

3 years ago

Read 2 more answers

How many litres of fuel will a car use to travel 450 km if its fuel consumption is 6,8 km/l?

valentina_108 [34]

Step-by-step explanation:

are you sure the fuel consumption is given by 6,8 km/l ?

normally it is given by l/100km.

but ok, let's assume this is correct.

it would mean the car can drive 6,8 km with every liter of fuel in the tank.

how many liters will the car need to go 450 km ?

well, as many liters as 6,8 fits into 450 :

450/6,8 = 66.17647059... liters

this is not a very fuel efficient car ...

7 0

2 years ago

Your bag of rice says to mix 1 cup of rice with 2 cups of water. dela requ prov a. What is the ratio of rice to water? refer to

EastWind [94]

Answer:

(a) 1:2

(b) 6 cups

Step-by-step explanation:

(a) Given,

amount of rice mixture contains= 1 cup

amount of water mixture contains= 2 cups

$\textrm{So, the ratio of rice to water}\ =\ \dfrac{\textrm{amount of rice in mixturte}}{\textrm{amount of water in mixture}}$

$=\ \dfrac{1}{2}$

So, the ratio of rice to water is 1:2.

(b) Amount of rice in mixture = 3 cups

$\textrm{So, the ratio of rice to water}\ =\ \dfrac{\textrm{amount of rice in mixturte}}{\textrm{amount of water in mixture}}$

$=>\ \dfrac{1}{2}\ =\ \dfrac{3}{\textrm{amount of water in mixture}}$

=> amount of water in mixture = 3 x 2

= 6 cups

(c) $\textrm{amount of rice in mixture}\ =\dfrac{1}{3}$

$\textrm{So, the ratio of rice to water}\ =\ \dfrac{\textrm{amount of rice in mixturte}}{\textrm{amount of water in mixture}}$

$=>\ \dfrac{1}{2}\ =\ \dfrac{\dfrac{1}{3}}{\textrm{amount of water in mixture}}$

$=>\textrm{amount of water in mixture}\ =\ \dfrac{2}{3}$

So, the amount of water in the mixture will be $\dfrac{2}{3}$ cup.

7 0

3 years ago