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BigorU [14]
3 years ago
5

There are 20 20 coins in a jar. Each coin is either a nickel or a quarter. If one of the coins is selected at random, the probab

ility of selecting a nickel is 0.6 0.6 . How many quarters are in the jar?
Mathematics
1 answer:
sveta [45]3 years ago
3 0

Answer: there are 8 quarters in the jar

Step-by-step explanation:

Let x represent the number of nickels that is inside the jar.

The total number of coins inside the jar is 20.

Probability is expressed as

Number of possible or favorable outcomes/total number of outcomes.

The probability of selecting a nickel is 0.6. This is expressed as

0.6 = x/20

Cross multiplying, it becomes

x = 20 × 0.6

x = 12

Since there are 12 nickels inside the jar, then the number of quarters would be

20 - 12 = 8

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Write an equation of the line passing through the point (7,3) that is parallel to the line y=2x-4. ​
SashulF [63]

Answer:

y=2x-11

Step-by-step explanation:

arralel lines have same gradient

since gradient of the known line is 2( the coefficient of x), it therefore follows that the gradient of the second line we want to find is also 2

So we know the gradient of the second line is 2, and we have one known point (7,3). We can therefore apply the formula for finding gradient to come up with the line

2=\frac{y-3}{x-7} \\\\y-3=2(x-7)\\\\y-3=2x-14\\\\y=2x-14+3\\\\y=2x-11

3 0
2 years ago
(NEED IN UNDER 30 MINUTES HELP HURRY) The dot plots below show the ages of students belonging to two groups of painting classes:
zhuklara [117]

The group that is most  likely to have a lower mean age of painting students is group A.

<h3>Which group is most  likely to have a lower mean age?</h3>

A dot plot is graph that is used to display data. The dots in a dot plot represents the frequency of a number.

Looking at the graph, it appears that group A has a lower age distribution. Thus, it is likely that it would have a lower mean.

To learn more about dot plots, please check: brainly.com/question/22746300

#SPJ1

5 0
2 years ago
Two sides and an angle​ (SSA) of a triangle are given. Determine whether the given measurements produce one​ triangle, two​ tria
Nataliya [291]
<h2>These measurements will not form a triangle.</h2>

Step-by-step explanation:

We have sine formula

          \frac{a}{sinA}=\frac{b}{sinB}=\frac{c}{sinC}

Given

        a = 9.7

        b = 49

        A = 26°

Substituting

        \frac{a}{sinA}=\frac{b}{sinB}=\frac{c}{sinC}\\\\\frac{9.7}{sin26}=\frac{49}{sinB}\\\\sinB=2.21

Value of sin B is greater than 1, which is not possible.

Hence these measurements will not form a triangle.

3 0
3 years ago
Find the value of x in each of the following<br> a) x/3-2 = 6<br> b) x/5+ 1 = 5
AnnyKZ [126]

A)

X/3 -2 = 6

Add 2 to both sides:

X/3 = 8

Multiply both sides by 3:

X = 24

B)

X/5 +1 = 5

Subtract 1 from both sides:

X/5 = 4

Multiply both sides by 5:

X = 20

6 0
3 years ago
Read 2 more answers
What is one value of x that makes the equation-16x^2+121=0 true
jeyben [28]

Answer:

x = ±11/4

Step-by-step explanation:

Rewrite -16x^2+121=0 as 16x^2 - 121=0 and then as 16x^2 = 121.

Take the square root of both sides.  This returns 4x = ±11, and so:

x = ±11/4

8 0
3 years ago
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