MATHEMATICS MIDDLE SCHOOL

I have a square piece of paper(10cm) I fold The square in half to make a rectangle (A1) I fold the rectangle again to make a square (A2) What is the perimeter of rectangle A1

And



what is the perimeter of square A2

Answers

Answer 1
Answer:

Answer:

  A1: 30 cm

  A2: 20 cm

Step-by-step explanation:

1) Folding the square in half reduces two of the edges to half their former length, so the perimeter is now ...

  sum of side lengths = 2·10 cm + 2·5 cm = 30 cm . . . A1

__

2) Again, the 10 cm edges are cut in half, so the perimeter of the square is ...

  sum of side lengths = 2·5 cm + 2·5 cm = 4·5 cm = 20 cm . . . A2

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A cell doubles every 15 minutes. If there is 1 cell at noon, how many cells will there be at 3 p.m.? Show work.

Answers

12:15 - 1+1 = 2
12:30 - 2 + 2 = 4
12:45 - 4 + 4 = 8
1 - 8 +8 = 16
1:15.......
.......
3 - 4096
okay so there is 1 cell and it starts doubling at 12:00 every 15 minutes that is 4 times every hour and there is three hours so 4 x 3 = 12 so it doubles 12 times then 12 x 2 = 24 so at 3pm that cell would have multiplied it self into 24 other cells 

The airplane has a wingspan of a feet and a tailspan of b feet. If the tailspan in the drawing is 2 inches, and a/b = 3, what is the actual wingspan of the airplane?Scale: 1 inch = 5 feet

Answers

x/2 = 3 (x= 3*2 = 6in)

6in = 30ft

Hope I become the brainliest answer

Answer:

30 feet is correct.

Step-by-step explanation:

Since a = 3b, the wingspan is 6 inches in the drawing, so it is 6x5 = 30 feet on the plane.

What is the opposite of –64? A. 46 B. –46 C. –64 D. 64

Answers

the answer is d 64!!

Becky and Tommy are asked to solve −4x − 25 = 8x + 15. Identify where one of them made an error. Becky Tommy −4x − 25 = 8x + 15 −4x − 25 − 8x = 8x + 15 − 8x −12x − 25 = 15 −12x − 25 + 25 = 15 + 25 −12x = 40 Negative 12x over 40 equals 40 over 40 x=negative three-tenths −4x − 25 = 8x + 15 −4x − 25 + 4x = 8x + 15 + 4x −25 = 12x + 15 −25 − 15 = 12x + 15 − 15 −40 = 12x negative 40 over 12 equals 12x over 12 x=negative ten-thirds

Answers

Answer:

The answer is D. Tommy added 15 wrong. :)

Step-by-step explanation:
you add by the quadrent squrr and get your answer

Identify the error in the student solution shown below. Find the correct answer.

Answers

Answer:

Since 0 in ln(3x) - 0 is not a logarithm, the  property of logarithms cannot be used here.

The difference shown cannot be written as a quotient of logarithms.

The step ln(x2) = ln(3x) - (0) reduces to

ln(x2) = ln(3x).

The possible solutions are 0 and 3, with 0 being extraneous.

Step-by-step explanation:

on edg

WHAT IS S=2PIR^2+2PIRH SOLVE FOR H

Answers

\n~\qquad\quad S\ =\ 2PIR^2+2PIRH\n\underline{-2PIR^2\qquad-2PIR^2\qquad\quad\ }\n\n S-2PIR^2=2PIRH\n\n 2PIRH\ =\ S-2PIR^2\n\underline{ :(2PIR)\qquad :(2PIR)}\n\n\n H=(S-2PIR^2)/(2PIR)\n\n\n H=(S)/(2PIR)-(2PIR^2)/(2PIR)\n\n\n H=(S)/(2PIR)-R


or:

\n~\qquad\quad S\ =\ 2PIR^2+2PIRH\n\n~\qquad\quad S\ =\ 2PIR(R+H)\n\underline{:(2PIR)\qquad :(2PIR)}\n\n\n~\ \ (S)/(2PIR)\ =\ R+H\n\n\n (S)/(2PIR)-R=H\n\n\n H=(S)/(2PIR)-R
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