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
Gwar [14]
3 years ago
7

The cost of a pen is 3 times the cost of a pencil and cost of a

Mathematics
1 answer:
valentinak56 [21]3 years ago
6 0

Answer:

1 Pen cost $2.25

Step-by-step explanation:

Assume:

Cost of Pen = a

Cost of pencil = b

Cost of notebook = c

a = 3b   -------------------(1)

c = 4a   -------------------(2)

2a + 6b + c = $18 -----(3)

From equation (1), b = a ÷ 3 ---------(4)

Substitute equations (2) and (4) in equation (3)

2a + 6 * (a ÷ 3) + 4a = $18

2a + 2a + 4a = $18

8a = $18

a = $2.25

Therefore, 1 Pen cost $2.25

You might be interested in
Bios me no understanding this. Wanna play dem video games in quarantine
ZanzabumX [31]

Answer:

i play game yes me do

Step-by-step explanation:

5 0
3 years ago
A square with sides of 3 squareroot 2 is inscribed in a circle. what is the area of one of the sectors formed by the radii to th
mrs_skeptik [129]
Drawing this square and then drawing in the four radii from the center of the cirble to each of the vertices of the square results in the construction of four triangular areas whose hypotenuse is 3 sqrt(2).  Draw this to verify this statement.  Note that the height of each such triangular area is (3 sqrt(2))/2.

So now we have the base and height of one of the triangular sections.

The area of a triangle is A = (1/2) (base) (height).  Subst. the values discussed above,   A = (1/2) (3 sqrt(2) ) (3/2) sqrt(2).  Show that this boils down to A = 9/2.

You could also use the fact that the area of a square is (length of one side)^2, and then take (1/4) of this area to obtain the area of ONE triangular section.   Doing the problem this way, we get (1/4) (3 sqrt(2) )^2.  Thus, 
A = (1/4) (9 * 2) = (9/2).  Same answer as before. 
4 0
3 years ago
Sathish is going on a 210021002100-kilometer road trip with 222 friends, whom he will pick up 150150150 kilometers after he begi
Zigmanuir [339]
Bro I’m rly sorry but I don’t know the answer to this
3 0
2 years ago
Find the area of a sector with a 4 inch radius and arc measure of 90 degrees. use 3.14 for pi.
gulaghasi [49]

Answer:

\frac{90}{360} \pi{r}^{2}  \\ \frac{1}{4}   \times 3.14 \times  { 4}^{2}  \\  = 12.56 {in}^{2}

<em>hope</em><em> </em><em>this</em><em> </em><em>helps</em><em> </em><em>you</em><em>.</em><em>.</em><em>.</em><em>.</em>

6 0
3 years ago
Simplify: square root of 81+18<img src="https://tex.z-dn.net/?f=%5Csqrt%7B7%7D" id="TexFormula1" title="\sqrt{7}" alt="\sqrt{7}"
Lemur [1.5K]

\sqrt{81 \:  +  \: 18 \sqrt{7}  \:  +  \: 7}

  • Factor the indicated expression:

\sqrt{(9 \:  +  \:  \sqrt{7} ) ^{2} }

  • Simplified the index, the root and also the exponent using the number 2.

\boxed{ \bold{9 \:  +  \:  \sqrt{7} }}

<h3><em><u>MissSpanish</u></em> </h3>
5 0
2 years ago
Other questions:
  • If you rent a car for one day and drive it for 100 miles, the cost is $40.00. If you drive it 220 miles, the cost is $46.00. Use
    6·1 answer
  • On a rectangular coordinate plane, a circle centered at (0, 0) is inscribed within a square with adjacent vertices at (0, -2√) a
    15·1 answer
  • How to graph circles​
    11·1 answer
  • Solve the system of equations y=3x+2 y=x2-4x+2​
    14·1 answer
  • If LM = 22 and MN = 15, find LN.
    5·1 answer
  • Find the area of the figure.
    15·1 answer
  • Stephen bought enough powdered juice mix to make 834gallons of juice. If his kids go through 125gallons of juice per week, how m
    13·2 answers
  • 2<br> 5p +<br> 3 4<br> +<br> 5 5<br> 15<br> Solve it
    8·1 answer
  • Height = 5cm<br> Base = 12cm
    6·2 answers
  • Evaluate the definite integral from pi/3 to pi/2 of (x+cosx) dx
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!