I need help with #11-13

Answers

Answer 1

Answer: #11. a13+t=3=16 b16 in all

#12.8+8=16

#13.10/2-2=3

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A running track in the shape of an oval is shown. The ends of the track form semicircles. A running track is shown. The left and right edges of the track are identical curves. The top and bottom edges of the track are straight lines. The track has width 68 m and length of one straight edge 140 m. What is the perimeter of the inside of the track?

Answers

two shapes.. a circle and a rectangle. The width of the rectangle serves as the diameter of the circle.

Length = 140 m ; Width = 68 m

Circumference of a circle = 2 π r
circumference of a cirlce = 2 * 3.14 * (68m/2) = 2 * 3.14 * 34 m = 213.52

length = 2 * 140 m = 280 m

perimeter of the oval = 213.52 m + 280 m = 493.52 m

Answer:

493.52

Step-by-step explanation:

Which of the trinomials below has 3x^2the GCF of its terms?A. 936 – 18x4 + 27x3
B. 3x4 + 9x2 - 6x?
C. 9x4 + 12x2 - 6x
D. 3x3 + 9x4 - 6x?

Answers

E. None of the above

Hannah has a grid of squares that had 12 rows with 15 squares in each row. She colors 5 rows of 8 squares in the middle of the grid blue. She colors the rest of the squares red. How many squares does Hannah color red?

Answers

there's a grid of squares with 12 rows and in each row there are 15 squares

from this grid she colours 8 squares from each row for 5 rows blue.

the rest of the squares she colours red

so first we have to find how many squares are there in the grid in total

so if each row has 15 squares

then 12 rows have - 15 x 12 = 180 squares

blue coloured squares

she colours 8 rows of 5 squares

so if 1 row has - 5 squares

then 8 rows have - 5 x 8 = 40 squares

from 180 squares, she colours 40 squares blue and the rest red colour

therefore the squares she colours red are

red squares = 180 - 40 = 140 squares

she colours 140 squares red

WORK:
12 rows of 15 squares = 12 × 15 = 180 squares
5 rows of 8 squares = 5 × 8 = 40 squares
180 squares - 40 squares = 140 squares
ANSWER:
Hannah colors 140 squares red.

413 divided by 14
How do you it?

Answers

You can either do this on the calculator, or in your head. As its a larger number, it is worth doing it on the calculator.
413/14= 29.5
The alternative method is to list all of the tens multiples, and the smaller multiples when you're getting close to the answer, and this will be able to help you.
14x10= 140
14x20=280
14x30= 420 (which is slightly too big)
14x29= 406 (slightly too small)
14x29.5= 413

Hope this helps :)

413/14 is how many times does 14 go into 413 is 29.5

How many times does 8 go into 144

Answers

8 goes into 144 18 times

It goes into 144 18 times

What is the value of the underlined digit in 91,764,350

Answers

The underlined digit is 700,000 because if you look at where the 7 is and take out the 91 and make all other numbers a 0 it turns into 700,000

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