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2 years ago

Solve the system using a matrix. NEED HELP ASAP!!:):)

Mathematics

2 answers:

icang [17]2 years ago

7 0

1,-4 sorry if wrong :(

natali 33 [55]2 years ago

4 0

Step-by-step explanation:

1.3x+2y=13

3x+2y+-2y=13+-2y

3x=-2y +13

3x/3=2y+13/3

The answer is x= -2/3 y+13/3

2.x= -2/3 y+ -1/3 z +13/3

3.x= -1/5 y +9/5

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I need to find the surface area. it's a cut sphere with a diameter of 14.

alex41 [277]

Given data:

The diameter of the cut sphere, D=14 in.

The radius of the cut sphere is,

$\begin{gathered} r=\frac{D}{2} \\ r=\frac{14}{2} \\ r=7\text{ in} \end{gathered}$

The cut sphere is called a hemisphere.

The surface area of a sphere is

$A_1=4\pi r^2$

So, the lateral surface area of a hemisphere is half the surface area of sphere. Therefore, the lateral surface area of a hemisphere is,

$\begin{gathered} A_2=\frac{4\pi r^2}{2} \\ A_2=2\pi r^2 \end{gathered}$

The hemisphere has a lateral surface and a circular surface. The area of the circular surface is,

$A_3=\pi r^2$

Therefore, the total area of the hemisphere is,

$\begin{gathered} A=A_2+A_3 \\ A=2\text{ }\pi r^2+\pi r^2 \\ A=3\text{ }\pi r^2 \end{gathered}$

The total surface area of a hemisphere is,

$\begin{gathered} A_{}=3\text{ }\pi r^2 \\ A=3\text{ }\pi\times7^2 \\ A=461.8in^2 \end{gathered}$

Therefore, the total surface area of the cut sphere is 461.8 square inches.

6 0

1 year ago

The width of a rectangle is twice as long as the length. if the length is increased by 50% and the width is decreased by 20%, th

Solnce55 [7]

Answer:

Step-by-step explanation:

I answered your question in #24317186. Apparently you asked it twice and no one helped you yesterday.

3 0

3 years ago

PLEASE HELP ME <br> SHOW ALL THE WorK BC I DONT know how to do it.<br> Will give brainliest

Citrus2011 [14]

Answer:

answer below

Step-by-step explanation:

∠3 = 76°

∠1 = ∠3 = 76° (vertical angle)

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3 years ago

Linda's account has a balance of −$45.50. If she owes the bank more than $30, her account gets closed. Which of the following is

AleksAgata [21]

Answer:

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Step-by-step explanation:

7 0

2 years ago

Read 2 more answers

See the screen shot can someone help me on this

AfilCa [17]

6*40= 240 + 6*2=12

240+12= 252

4 0

3 years ago