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natka813 [3]
2 years ago
14

When using re-grouping to solve 21 x 43, what are the four products that would be calculated and then added?

Mathematics
2 answers:
Butoxors [25]2 years ago
7 0
The third one because 21 times 43 is 903 and 800 + 40 + 60 + 3 = 903
pshichka [43]2 years ago
3 0

Answer:

c

Step-by-step explanation:

21×43

=(20+1)×(40+3)

=800+40+60+3

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2 + 7c - 4c2 – 3c + 4
iragen [17]

Answer:

-4c² + 4c +6

Step-by-step explanation:

combine like terms

2+ 4 = 6

7c - 3c = 4c

- 4c

Hope this helps!

8 0
3 years ago
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zubka84 [21]

Answer:

(x+1)(3x^3+2x^2-4x+4)

Step-by-step explanation:

I hope this helps!

7 0
3 years ago
Which of the following is the measure of angle RCP?
enyata [817]

Answer:

From the information provided we have:

PD ≅ RD (= 11)

∠CPD ≅ ∠CRD (= 90°)

They both have CD as the hypotenuse.

=> ΔCPD ≅ ΔCRD

=> ∠PCD ≅ ∠RCD

Now we know that:

∠RCP = ∠PCD + ∠RCD

∠RCP = 2 · ∠RCD

∠RCP = 2 · 33° = 66°

So the answer is B

5 0
3 years ago
Read 2 more answers
What is the third angle of a right triangle if one of the angles measures 51.
Elodia [21]

Answer:

39

Step-by-step explanation:

The short answer is 39.

Every triangle has 180 degrees. There are no exceptions to this rule.

Since a triangle has 3 angles, all three together must add up to 180o

A right angle = 90 degrees always.

You are given 51 degrees as your second angle

The third one is x

x + 51 + 90 = 180                   Total of three angles must be 180

x + 141 = 180                           The left has been added to give 141

x = 180 - 141                            Subtract 141 from both sides

x = 39                                     The third angle = 39    

3 0
3 years ago
City electric provides electricity for 1/8 of the homes in the center city. city electric provides electricity for (blank) % of
AVprozaik [17]
The answer is ...

C. 12.5

(You divide 1 to 8)
7 0
3 years ago
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