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ira [324]
3 years ago
12

Find the missing number ___:7 = 12:21a.14b.12c.4d.3

Mathematics
1 answer:
Novay_Z [31]3 years ago
6 0
x:7=12:21\to\dfrac{x}{7}=\dfrac{12}{21}\ \ \ |cross\ multiply\\\\21x=7\cdot12\\21x=84\ \ \ |divide\ both\ sides\ by\ 21\\\boxed{x=4}\\\\Other\ method:\\\dfrac{x}{7}=\dfrac{12}{21}\\\\21:7=\boxed3\to12:\boxed3=4\\\\\boxed{\frac{4}{7}=\frac{12}{21}\to4:7=12:21}
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(15pts) factor each completly
Natali [406]
Your answers:

10) (m+7)(m+8) 11) (b-10)(b+2)

12) (k-4)(k+10) 13) (n-9)(n-8)

14) (7r+3)(r-2) 15) (5a+6)(a+2)

Hope it helps
5 0
3 years ago
Read 2 more answers
Help me please. What is (2a+8) + (4a +5)
Rom4ik [11]

Answer:

6a + 13

Step-by-step explanation:

2a + 4a = 6a

8 + 5 = 13

6a + 13

8 0
2 years ago
Read 2 more answers
If m∠A =91° and m∠B = 40°, find m∠1.
marusya05 [52]

Answer:

m∠1 is calculated as 49°.

Step-by-step explanation:

Consider the angles are the interior angles of a triangle.

                      m∠A =91°

                      m∠B = 40°

                      m∠1  = ?

We know that the sum of interior angles of a triangle is 180°. So,

                          m∠A + m∠B + m∠1 = 180°

                      or, m∠1 = 180°- m∠A - m∠B

                      or, m∠1 = 180°- 91° - 40°

                      or, m∠1 = 49°

Hence, m∠1 = 49°.

7 0
3 years ago
Pleaseee helpppppp helpppppp​
Crazy boy [7]

Given:

The given table represents the ingredient need to make 4 muffins.

To find:

The amount of flour needed to make 12 muffins.

Solution:

We have, the data for 4 muffins.

From the given table it is clear that,

Flour need for 4 muffins = 250 g

Flour need for 1 muffins = \dfrac{250}{4} g

Flour need for 12 muffins = \dfrac{250}{4}\times 12 g

                                          = 250\times 3 g

                                          = 750 g

So, 750 g flour is need to make 12 muffins.

Therefore, the correct option is D.

8 0
3 years ago
Read 2 more answers
How can you use the sign of the points to determine location
I am Lyosha [343]

Answer:

please specify the question being asked

Step-by-step explanation:

8 0
3 years ago
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