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Triss [41]
3 years ago
9

7(3c + 2) - 9(3c + 2) + 2c​ can u show workpls

Mathematics
1 answer:
Karo-lina-s [1.5K]3 years ago
7 0

Step-by-step explanation:

=7(3c + 2) - 9(3c + 2) + 2c

=21c+14-27c-18+2c

= -4c-4

=-4(c+1)

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Martin is two years younger than three times his daughter Ada’s age. The sum of their ages is 54. If Ada’s age is given by a, th
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Read 2 more answers
A boat travels upstream for 48 miles in 3 hours and returns in 2 hours traveling downstream in a river. What is the rate of the
alekssr [168]

Answer:

20 mph and 4 mph

Step-by-step explanation:

GIVEN: A boat travels upstream for 48 miles in 3 hours and returns in 2 hours traveling downstream in a river.

TO FIND: What is the rate of the boat in still water and the rate of the current.

SOLUTION:

Let the speed of boat in still water be s and speed of current be a.

\therefore speed of water in upstream =s+a

  speed of water in downstream =s-a

As  speed=\frac{distance}{time}

s+a=\frac{48}{3}=16

s-a=\frac{48}{2}=24

Solving both we get

s=20\text{ mph}

a=4\text{ mph}

Hence speed of boat in still water and rate of current is 20mph and 4mph respectively.

3 0
4 years ago
I need help! Please no link answer :(
stiks02 [169]

Answer:

B. 30

Step-by-step explanation:

Given.:

m<4 = 2x°

m<5 = 4x°

Required:

Value of x

Solution:

<4 and <5 are angles in a straight line, therefore:

m<4 + m<5 = 180°

Substitute

2x + 4x = 180°

6x = 180°

x = 180/60

x = 30

3 0
3 years ago
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