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3 years ago

Can u give an explanation for the answer

Mathematics

1 answer:

Ber [7]3 years ago

5 0

Answer:

There are 8 quarters in the jar.

Step-by-step explanation:

There are 20 coins in a jar.

Each coin is either a nickel or a quarter.

The probability of selecting a nickel is 0.6

Let's assume there are x number of nickels

The probability of selecting a nickel coin is $\frac{x}{20}$ = 0.6

So x = 0.6 × 20 = 12

Hence there are are 12 nickel coins and 20 - 12 = 8 quarter coins.

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I need help!! i just need the equation that’s all, i’ll give brainliest

11111nata11111 [884]

Answer:

(x²-16x)

Step-by-step explanation:

thats all just multiply then

7 0

3 years ago

Find x and y. Remember that a + bi = c + di exactly when a = c and b = d. 8 = (4+8i)(x+yi)

irakobra [83]

x+yi = 8/(4+8i)x+yi = 2/(1+2i)x+yi = 2/(1+2i) × (1−2i)/(1−2i)x+yi = (2−4i) /5x+yi = 2/5−4/5i

x= 2/5
y= -4/5i

3 0

3 years ago

The expression (x+j)(x-j)(x-k) can be rewritten as x^3-5x^2-4x+t, where j,k, and t are constants. Which of the following is the

kirza4 [7]

The correct option is: 20

Explanation

The expression $(x+j)(x-j)(x-k)$ can be rewritten as $x^3-5x^2-4x+t$

That means: $(x+j)(x-j)(x-k)= x^3-5x^2-4x+t$

Now simplifying the left side, we will get....

$(x+j)(x-j)(x-k)= x^3-5x^2-4x+t\\ \\ (x^2-j^2)(x-k)= x^3-5x^2-4x+t\\ \\ x^3-kx^2-j^2x+j^2k= x^3-5x^2-4x+t$

Now comparing the co-effcients of like terms in left and right side, we will get.....

$k=5, j^2=4 \\ \\ and\\ \\ t=j^2k\\ \\ So, t= (4)(5) =20$

Thus, the value of 't' will be 20.

8 0

3 years ago

Gail is learning how to bake cookies. She found that 2 out of every 9 cookies are burnt. If Gail baked 225 cookies, how many bur

dmitriy555 [2]

Answer:

Step-by-step explanation:

225*2/9 = 50

4 0

3 years ago

If x:y = 2:5, find the value of (-x+3y):(2x+y)

Anit [1.1K]

Answer:

let x=2t and y=5t

-x+3y = -2t+15t = 13t

2x+y = 4t+5t = 9t

So the ratio is 13t : 9t

So, the ratio is 13 : 9

6 0

3 years ago