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kykrilka [37]
4 years ago
11

Help Please 25 points for real answers

Mathematics
1 answer:
trasher [3.6K]4 years ago
7 0
1. B
 
2. D

3. C= πD
 a) 204π or  641 cm 
A= π r²
 b) π (102)²
10404π squared cm or 32669 squared cm

4. C

5. D
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Imagine you are teaching a younger student how to factor. Describe in full sentences what you would say to teach the young stude
djyliett [7]

Answer:

x^2+ 4x - 21 =(x-3)(x+7)

Step-by-step explanation:

To factor the trimonial: x^2+ 4x - 21, we follow these steps:

Step 1: Multiply the first and last term

-21 \times x^2=-21x^2

Step 2: List out product factors of the term derived above

-21=-1 \times 21\\ -21=-3 \times 7\\-21=3 \times -7\\-21=1 \times -21

Step 3: Determine which of the factors sum up to the middle term 4x

The required product is: -3 and 7

Therefore: -3x+7x=4x

Step 4: Replace the middle term by the expression derived in step 3 and factorize.

x^2+ 7x -3x- 21\\=x(x+7)-3(x+7)\\=(x-3)(x+7)

3 0
3 years ago
Order the following expressions by their values from least to greatest​
Licemer1 [7]

Answer:

Step-by-step explanation:

a = -1

b = 2

c = 3

a + (-c) = -1 + (-3) = -4

Both numbers have same sign(-Ve).So add and the result will have the -Ve sign.

c - (-b) = c + b = 3 + 2 = 5

b = 2

Least to greatest: a +(-c)  , b , c-(-b)

4 0
3 years ago
PLEASE HELP I NEED THIS QUICK IM SO STUCK.<br>​
Marat540 [252]

Answer:

I think it is D.

Step-by-step explanation:

The bottom is pounds so it's 1 pound. The cost is $4 as the unit price it would be 1 pound/ 4 dollars. You put money on top so yeah... I'm really sorry if it's wrong.

7 0
3 years ago
Read 2 more answers
Write an equation of the line that passes through (2,7) and (0, - 5).
S_A_V [24]
Hope this helps! The slope of the line passing through
(
2
,
7
)
and
(
0
,
−
5
)
is
m
=
y
2
−
y
1
x
2
−
x
1
=
−
5
−
7
0
−
2
=
−
12
−
2
=
6
.

5 0
3 years ago
Find a1 if Sn = 89,800, r = 3.4, and n = 10. Round to the nearest hundredth if necessary.
xxMikexx [17]

Answer:

a_1=1.04

Step-by-step explanation:

We have a geometric  sequence with:

Sn = 89,800, r = 3.4, and n = 10

Where

Sn is the sum of the sequence

r is the common ratio

a_1 is the first term in the sequence

n is the number of terms in the sequence

The formula to calculate the sum of a finite geometric sequence is:

S_n=\frac{a_1(1-r^n)}{1-r}

Then:

89,800=\frac{a_1(1-(3.4)^{10})}{1-3.4}

Now we solve for a_1

89,800(1-3.4)=a_1(1-(3.4)^{10})

a_1=\frac{89,800(1-3.4)}{1-(3.4)^{10}}\\\\a_1=1.04

4 0
3 years ago
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