1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ikadub [295]
3 years ago
5

Can someone help me I have two more other questions they are 15 points each I just posted them right now! Thanks so much

Mathematics
1 answer:
nlexa [21]3 years ago
8 0

Answer:

$10 coins: 21

$20 coins: 24

Step-by-step explanation:

heyy me again

So we can create 2 equations where

x = number of $10 coins

y = number of $20 coins:

x + y = 45

10x + 20y = 690

we can move equation 1 around so that we can get a value of x

x = 45 - y

now we can substitute x into the second equation

10(45 - y) + 20y = 690

450 - 10y + 20y = 690

10y = 240

y = 24

Now plug in y back into the first equation

x = 45 - y

x = 45 - 24

x = 21

You might be interested in
Point R is on line segment QS. Given RS = 13 and QS = 20, determine the length of QR
Aleksandr-060686 [28]

Answer:

Length of QR = 7

Step-by-step explanation:

20 - 13 = 7

6 0
3 years ago
A circle has a diameter of 16 inches. What is the circumference of the circle using function on the calculator?
Kobotan [32]

Answer: 50.26548 (50.27)

Step-by-step explanation:

Circumference = 2 x π x r(radius)

Diameter = 2 x r(radius)

C = π x 16 = 50.26548

3 0
3 years ago
A sample of an unknown liquid has a volume of 12.0 mL and a mass of 6 g. What is its density?
NemiM [27]
Density = Mass/Volume
Density = 6/12 = 0.5 g/mL or 0.5 kg/L

6 0
3 years ago
Help needed math 3 - 10 points read closely
inessss [21]
<h2>Hello!</h2>

The answer is:

The answer is the fourth option,

f(-3)=-\frac{1}{3}

<h2>Why?</h2>

Piecewise functions are functions that are composed by two or more expressions, the expression to use will depend of the domain or input that we need to evaluate.

We are given the piecewise function:

\left \{ {{\frac{1}{x}, if x

There, we know that:

We should use the first expression if the value to evaluate is less than -2.

So, for this case, the function will be:

f(x)=\frac{1}{x}

We should use the second expression if the value to evaluate is greater or equal than 2.

So, for this case, the function will be:

f(x)=x^{2}

Now, since we are given that the value to evaluate is -3, and its less than -2, we need to use the first expression, and evaluate it.

-3

So, evaluating the function we have:

f(x)=\frac{1}{x}

f(-3)=\frac{1}{-3}

f(-3)=-\frac{1}{3}

Hence, we have that the answer is the fourth option,

f(-3)=-\frac{1}{3}

Have a nice day!

7 0
3 years ago
Evaluate the expression. Choose the best answer. <br><br><br><br><br><br> <img src="https://tex.z-dn.net/?f=8%5EP4" id="TexFormu
Morgarella [4.7K]
N P r = (n!)/((n-r)!)
8 P 4 = (8!)/((8-4)!)
8 P 4 = (8!)/(4!)
8 P 4 = (8*7*6*5*4!)/(4!)
8 P 4 = 8*7*6*5
8 P 4 = 1680

The final answer is 1680

4 0
3 years ago
Other questions:
  • Assignment
    6·1 answer
  • What times what can equal 26
    9·2 answers
  • A computer randomly picks a number from the group 75, 76, 77, 78, 79.
    10·1 answer
  • A scientist uses 2.8*10^12 cells in one experiment, which is 2,000 times the number of cells she uses in a second experiment. Wr
    6·1 answer
  • Whats 7,080,267 in expanded form
    7·2 answers
  • .24 repeating as a fraction but the 4 is the only thing repeating
    5·1 answer
  • 84,75,90,87,99,91,85,88,76,92,94
    12·1 answer
  • Please help me out!​
    7·1 answer
  • Please help me if you can. please show how you got the answer.
    8·1 answer
  • Find the slope of the line that passes through the points (2,-8) and (3,1)
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!