MATHEMATICS MIDDLE SCHOOL

A circle has a circumference of 15cm what is the diameter of the circle

Answers

Answer 1
Answer: 4.77cm
The formula for the diameter can be expressed as C = πd where d is the diameter as the diameter is twice the radius. C = 15π = 47.12cm (2dp)

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shalyn went to to the movies. She spent 2/5 of her money on a ticket and 3/7 on popcorn. How much did she spend?
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Which problems result in a positive number? Choose all answers that are correct. A. –4.6 • 1.6 B. –10 • (–5.2) C. 8.4 ÷ 2 D.

Answers

Well you can automatically eliminate, A, because when you multiply one number that's positive and another number that's negative the result is always going to be negative.
However, when you multiply two negatives the result is always positive!

So, the only ones up there that would result in a positive number is B and C

***D. was not posted so I cannot determine that one!

(x+2) is one of the factors of the polynomial x³+13x²+32x+20. Find its remaining factors.A little help....​

Answers

Answer:

x^2+11x+10

or

(x+1)(x+10) since you can factor x^2+11x+10

Step-by-step explanation:

Let's do synthetic division.

We are dividing by x+2, so -2 will be on the outside. Like this:

-2 |         1          13          32         20

   |                     -2        -22         -20

   |___________________________

             1          11           10            0

The remainder is 0, so (x+2) is indeed a factor of x^3+13x^2+32x+20.

The other factor we found by doing this is (x^2+11x+10).

You can find more factors by factoring x^2+11x+10.

Two numbers that multiply to be 10 and add to be 11 is 10 and 1 so the factored form of x^2+11x+10 is (x+10)(x+1).

3. Danielle sorted her marbles into 8 groups. She put 3 red marbles, 3 blue marbles, and 2yellow marbles in each group. How many marbles did she have in all?
A. 16
B. 18
C. 24
D. 64

Answers

Answer:

D

Step-by-step explanation:

Each group has

3 red

3 blue

2 yellow

That's a total of 3 + 3 + 2 = 8 marbles per group

Also, there are 8 same type of groups, so total number of marbles in 8 groups would be:

8 * 8 =  64

Total marbles = 64

Answer choice D is right.

Plz I really need help GIVING OUT 52 POINTS!!!Part A: The Sun produces 3.9 ⋅ 1033 ergs of radiant energy per second. How many ergs of radiant energy does the Sun produce in 2.45 ⋅ 105 seconds? Express your answer in scientific notation and show your work. (5 points)

Part B: Which is the more reasonable measurement of the distance between the tracks on a DVD:
7.4 ⋅ 10−4 mm or 7.4 ⋅ 104 mm? Justify your answer. (5 points)

Answers

I think the answer is 7.4 x 10-4mm, because a CD is pretty small.

7.4 x 10-4mm, I think. Hope this helps! Have a great day!

Is the following statement true or false?Every diameter of a circle is a chord.
Justify.



(I know it's true but could someone help because im stuck on how i should word it)

Answers

When you word it just use the question to help. ex: The statement "Every diameter of a chord" is true.

Which expression has a value of 8, using only four 4s and any of the following: + , – , • , ÷, exponents, and/or parentheses? A. 4 • 4 – 4 – 4

B. 4 • 4 • 4 – 4

C. 4 • 4 + 4 – 4

D. 4 • (4 + 4) – 4

Answers

PEMDAS
A. 4*4-4-4=16-4-4=12-4=8 true
B. 4*4*4-4=16*4-4=64-4=60, not 8 false
C. 4*4+4-4=16+0=16, not 8, incorect
D. 4(4+4)-4=4(8)-4=32-4=28, not 8 incorrect


A

Answer:

A

Step-by-step explanation:

4x4-4-4= 8
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