Mathematics High School

A bag contains 25 marbles. Some are red and the rest are black. There are 4 red marbles per black marble,
a. How many red marbles are in the bag?

Answers

Answer 1

Answer:

20 red marbles

Step-by-step explanation:

Answer 2

20 red marbles. I know this because there is 20 red marbles in the jar

Related Questions

Which is the inverse of the function a(d)=5d-3? And use the definition of inverse functions to prove a(d) and a-1(d) are inverse functions

Answers

Answer:

[tex]a'(d) = \frac{d}{5} + \frac{3}{5}[/tex]

[tex]a(a'(d)) = a'(a(d)) = d[/tex]

Step-by-step explanation:

Given

[tex]a(d) = 5d - 3[/tex]

Solving (a): Write as inverse function

[tex]a(d) = 5d - 3[/tex]

Represent a(d) as y

[tex]y = 5d - 3[/tex]

Swap positions of d and y

[tex]d = 5y - 3[/tex]

Make y the subject

[tex]5y = d + 3[/tex]

[tex]y = \frac{d}{5} + \frac{3}{5}[/tex]

Replace y with a'(d)

[tex]a'(d) = \frac{d}{5} + \frac{3}{5}[/tex]

Prove that a(d) and a'(d) are inverse functions

[tex]a'(d) = \frac{d}{5} + \frac{3}{5}[/tex] and [tex]a(d) = 5d - 3[/tex]

To do this, we prove that:

[tex]a(a'(d)) = a'(a(d)) = d[/tex]

Solving for [tex]a(a'(d))[/tex]

[tex]a(a'(d)) = a(\frac{d}{5} + \frac{3}{5})[/tex]

Substitute [tex]\frac{d}{5} + \frac{3}{5}[/tex] for d in [tex]a(d) = 5d - 3[/tex]

[tex]a(a'(d)) = 5(\frac{d}{5} + \frac{3}{5}) - 3[/tex]

[tex]a(a'(d)) = \frac{5d}{5} + \frac{15}{5} - 3[/tex]

[tex]a(a'(d)) = d + 3 - 3[/tex]

[tex]a(a'(d)) = d[/tex]

Solving for: [tex]a'(a(d))[/tex]

[tex]a'(a(d)) = a'(5d - 3)[/tex]

Substitute 5d - 3 for d in [tex]a'(d) = \frac{d}{5} + \frac{3}{5}[/tex]

[tex]a'(a(d)) = \frac{5d - 3}{5} + \frac{3}{5}[/tex]

Add fractions

[tex]a'(a(d)) = \frac{5d - 3+3}{5}[/tex]

[tex]a'(a(d)) = \frac{5d}{5}[/tex]

[tex]a'(a(d)) = d[/tex]

Hence:

[tex]a(a'(d)) = a'(a(d)) = d[/tex]

help me real quickhahahahaha

Answers

Answer:

Step-by-step explanation:

2d= 2 x 8= 16

16+3= 19

Answer:

Step-by-step explanation:

2d + 3 (d=8)

(2*8) + 3 =

16 + 3 =

Which values could be the values of x and y?

Answers

Answer:

1 3/4, 9 1/4

Step-by-step explanation:

continue the pattern

What that person said^^^^

Substitute 7 for xand evaluate the expression below.
9x-2x
Answer here

Answers

Answer:

The answer to this equation is 49

Step-by-step explanation:

9x-2x

9×7=63

2×7=14

63-14=49

The least common denominator of[tex]\frac{1}{6} and \frac{5}{12}[/tex] is 12.

TrueFalse

Answers

True 1/6 can become 2/12 by multiplying it by two so the common denominator would be 12. 2/12 and 5/12 have a common denominator of 12

Tell me what the letters A, H, and K stand for in the vertex form.
Vertex Form of a Quadratic Function
f(x) = a(x-h)2+k
Enter text
Enter text
Enter text

Answers

Greetings.

The answer is

a = determines the shape of parabola (upward, downward, narrow or wide)

h = determines the transformation of the graph for x-axis (For example, (x+1)², the graph would move from x=0 to x=-1

k = determines the transformation of the graph for y-axis. (For example, x²+1, the graph would move from y = 0 to y = 1.

I got 24 miles for each kind of gas in my car which one of the following is a equivalent radio of miles to gallons.
A. 48 to 2
B. 2 to 48
C. 1 to 24
D. 3 to 240

Answers

I believe that the answer is B

if correct will get brainlliest

Answers

Answer:

Gold is LESS expensive than platinym because SLOPE of graph is LESS

SLOPE gives UNIT DOLLARS PER OUNCE.

Step-by-step explanation:

if correct‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎

25 POINTS!! ples help I will only give brainliest to people who explain cuz there is a lot who just put whatever
I DON'T WANT THE ANSWER ONLY EXPLAIN!!

Answers

One Answer: 2/5

==================================================

Explanation:

Let's say that p is the leading coefficient and q is the last term.

To list out the possible rational roots, we need to find the factors of p and q. Dividing said factors over one another will lead to all the possible rational roots.

In this case, the leading coefficient is -5. The factors here are:

-1, 1, -5, 5

List the negative values as well as the positive values.

The factors of -2 are:

-1, 1, -2, 2

Now divide each factor of q = -2 over each factor of p = -5. It's very easy to get lost here because there are going to be 4*4 = 16 divisions going on. I recommend using a table to keep everything organized. See the chart below.

Anything in a gray box is a possible rational root. If we list the unique items only, we get this list = { -1, 1, -1/5, 1/5, -2/5, 2/5 } which are all the possible rational roots.

Compare those items with your possible answer choices. The only match here is 2/5

So 2/5 is the only possible answer in this case.

what is y=1/2x-10 Help me

Answers

Slope intercept form? Because slope intercept form is y= mx + b

Not sure what you are trying to figure out here

Dont answer this PLEAS

Answers

Answer:

why? also the answer is 1.6y+y-4/15y+7/6y=21/3

We move all terms to the left:

1.6y+y-4/15y+7/6y-(21/3)=0

Domain of the equation: 15y!=0

y!=0/15

y!=0

y∈R

Domain of the equation: 6y!=0

y!=0/6

y!=0

y∈R