MATHEMATICS MIDDLE SCHOOL

Whats 72x43 in the standard algorithm

Answers

Answer 1

Answer:

Answer:

∞

Step-by-step explanation:

everything equals infinity if you don't think about it

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Find the value of b and cPLEASE SHOW WORK!

b(3x $x^(2)$ -2x+c) = 9 $x^(2)$ - 6x+15

Answers

Answer:

b=3

c=5

Step-by-step explanation:

b(3x^{2}-2x+c) = 9x^{2} - 6x+15

Distribute

3b x^2 -6x +bc = 9x^2 -6x +15

Each term must be equal

3bx^2 = 9x^2

3b = 9

Divide by 3

3b/3 = 9/3

b =3

bc = 15

3c =15

Divide by 3

3c/3 = 15/3

c =5

The debate team is showing a video of their recent debate. The first showing begins at 3:15 p.m. The second showing starts at 4:50 p.m with a 1/2 break between the showings. The second showing started 20 minutes late. Will the second showing be over by 6:30 p.m? EXPLAIN you answer.

Answers

Given:
3:15 pm - start of first showing.
30 minutes break;
20 minutes late - 2nd showing.
4:50 - start of second showing.

4:50 - 0:20 = 4:30 should be the start of the second showing.
4:00 - 4:30 = 1/2 hour break
3:15 - 4:00 = duration of the 1st showing. 45 minutes in all.

4:50 + 0:45 = 5:35 pm end of the 2nd showing.

Yes, the 2nd showing will be over by 6:30 pm.

Answer:

Given:

3:15 pm - start of first showing.

30 minutes break;

20 minutes late - 2nd showing.

4:50 - start of second showing.

4:50 - 0:20 = 4:30 should be the start of the second showing.

4:00 - 4:30 = 1/2 hour break

3:15 - 4:00 = duration of the 1st showing. 45 minutes in all.

4:50 + 0:45 = 5:35 pm end of the 2nd showing.

Yes, the 2nd showing will be over by 6:30 pm.

Step-by-step explanation:

Concrete is a mixture of cement, sand, and gravel. The Masons will purchase a cement, sand, and gravel mixture in a ratio of 1:2:3. How many pounds of each material are needed for 60 lb of concrete mix?

Answers

10 pounds of cement, 20 pounds of sand, 30 pounds of gravel. 10:20:30 = 1:2:3
10 + 20 + 30 = 60

A student government organization is selling Christmas trees as a fundraiser. On Friday, they sold 5 noble fir trees and 3 douglas fir trees for a total of $420. On Saturday, 12 noble fir trees and 9 douglas fir trees were sold for a total of $1,080. What is the cost per tree for each type?how much is 1 douglas?
how much is 1 noble fir?

Answers

You have to do a system, lets say x are noble fir trees and y are douglas fir trees,
5x+3y=420
12x+9y=1080

if you solve this you get,
x=60 and
y=40
SO Noble fir trees cost $60 and Douglas fir trees cost $40.

What is the best estimate for the product of 289 and 7

Answers

I would estimate it as (300 x 7) = 2100

Then I would subtract (11 x 7) + 77 from that to get the exact answer of 2023

~~~~~~~~~~
I didn't use a calculator or paper. The 'trick' is to notice that 289 = (300 - 11)

I was taught to round it up to the nearest ten, then multiply it like this,
289, rounded up is 290, then seperate the number, (200 + 90)

200 X 7 = 1400 (multiply the numeral, then add the zeros)
90 X 7 = 630 (repeat the same process)

1400 + 630 = 2030 (actual answer = 2023)

A worm travels 1250 millimeters.how many meters did the worm travel?