3 years ago

Which choice is NOT equal to the others? A) − 2/ 5 B) −2/ 5 C) 2/ 5 D) 2/ −5

Mathematics

1 answer:

Elden [556K]3 years ago

4 0

Answer:

c) 2/5

Step-by-step explanation:

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Can someone answer this question please please help me I really need it if it’s correct I will mark you brainliest .

MrRissso [65]

Formula for the area of a face of a cube: A = length x width

Let's find the area of one face.

A = 5 x 5

A = 25

Now, let's multiply the area of one face by 6 because a cube has 6 faces.

25 x 6 = 150

A = 150 square centimeters

Hope this helps! :)

4 0

3 years ago

F 9 is added to twice a number and this sum is multiplied by 4, the result is the same as if the number is multiplied by 4 and

riadik2000 [5.3K]

Let
x---------> the number

we know that
[9+2x]*4=4x+12
36+8x=4x+12
8x-4x=12-36
4x=-24
x=-24/4
x=-6

the answer is
-6

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3 years ago

julia, keller and israel all made 219.75 dollars in total. keller made 37.50 and israel made 12 less than keller. what did each

krek1111 [17]

Keller=37.50
Israel=25.50
Julia=194.25

8 0

4 years ago

The function Q(x)=2x^2-kx+18. For what value of k does Q(x) have one distinct real solution? (NEEDS TO BE DONE WITHIN 2 HOURS!)

Aliun [14]

Answer:

k = 12

Step-by-step explanation:

Given:

The equation $Q(x)=2x^2-kx+18$

To find:

Value of $k = ?$ for which the given equation has one distinct real solution.

Solution:

The given equation is a quadratic equation.

There are always two solutions of a quadratic equation.

For the equation: $ax^{2} +bx+c=0$ to have one distinct solution:

$b^2 - 4ac = 0$

Here,

a = 2,

b = -k and

c = 18

Putting the values, we get:

$(-k)^2 - 4\times 2\times 18 = 0\\\Rightarrow k^2 = 18\times 8\\\Rightarrow k^2 =144\\\Rightarrow k = 12$

The equation becomes:

$Q(x)=2x^2-12x+18$

And the one root is:

$2(x^2-6x+9 ) = 0\\\Rightarrow 2(x-3)^2=0\\\Rightarrow x = 3$

4 0

3 years ago

Simplify this expression<br> (7)(2x-5)

ruslelena [56]

14x-35 is answer I think

6 0

3 years ago