All categories

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.

You might be interested in

In the parking lot there are 1960 convertibles and 490 minivans, for a total of 2450 cars all together what is the ratio of cars

Sidana [21]

Answer: 5:4

Step-by-step explanation:

Given : The number of convertibles = 1960

The number of minivans = 490

Total cars = 2450

The ratio of A to B can also be written as $\dfrac{A}{B}$ .

The ratio of cars to convertibles = $\dfrac{\text{Number of cars}}{\text{Number of convertibles}}$

$=\dfrac{2450}{1960}\\\\=\dfrac{5}{4}\ \ \ \text{[Simplest form]}$

Hence, the ratio of cars to convertibles = 5:4

4 0

3 years ago

Factor the expression completely over the complex numbers. X3+5x2+9x+45

shepuryov [24]

$x^3+5x^2+9x+45=x^2(x+5)+9(x+5)=(x+5)(x^2+9)=(*)\\\\x^2+9=x^2+3^2=x^2-(-1)(3^2)=x^2-(i^2)(3^2)=x^2-(3i)^2\\\\i=\sqrt{-1}\to i^2=-1\\\\(*)=(x+5)[x^2-(3i)^2]=(x+5)(x-3i)(x+3i)\\\\Used:\ a^2-b^2=(a-b)(a+b)\\\\Answer:\ x^3+5x^2+9x+45=(x+5)(x-3i)(x+3i)$

4 0

3 years ago

Read 2 more answers

Mrs. Montgomery earns a 6.5% commission on her total sales. Last month, she had sales of $55,780.

jok3333 [9.3K]

Answer:

Commission: $3625.70

Total (sales + commission): $59405.70

Step-by-step explanation:

6.5% of 55780 = 0.065 × 55780 = 3625.7

55780 increase 6.5% =

55780 × (1 + 6.5%) = 55780 × (1 + 0.065) = 59405.7

7 0

3 years ago

Select the statement that describes this expression: 10 + fraction 1 over 4x (5 + 3) − 3.

Valentin [98]

Answer:

10 more than fraction 1 over 4 of the sum of 5 and 3, then subtract 3

Step-by-step explanation:

Can't be the other ones

6 0

3 years ago

Read 2 more answers

Evaluate when x = 7 and y = 6<br> 2x - 37

Zarrin [17]

Answer:

-23

Step-by-step explanation:

2x - 37 =

2(7) - 37 =

14 - 37 =

-23

5 0

3 years ago