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Alenkinab [10]
3 years ago
13

Work out the value of 1. 7/2 -a ² 2. 3x-8 = 19

Mathematics
2 answers:
Zanzabum3 years ago
8 0

Answer:

1.   -45 1/2.

2.   x = 9.

Step-by-step explanation:

a/b - a^b   when a = 7 and b = 2

= 7/2 - 7^2

= 7/2 - 49

= -91/2

= -45 1/2.

3x - 8 = 19

3x = 19 + 8 = 27

x = 9.

ratelena [41]3 years ago
3 0
Yes it is very easy, but
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3 years ago
How do you divide a fraction
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8 0
3 years ago
Read 2 more answers
What is 85% of 891? (please keep answer as decimal)
Vladimir79 [104]

Answer:

757.35

Step-by-step explanation:

1. We assume, that the number 891 is 100% - because it's the output value of the task. 

2. We assume, that x is the value we are looking for. 

3. If 891 is 100%, so we can write it down as 891=100%. 

4. We know, that x is 85% of the output value, so we can write it down as x=85%. 

5. Now we have two simple equations:

1) 891=100%

2) x=85%

where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

891/x=100%/85%

6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 85% of 891

891/x=100/85

(891/x)*x=(100/85)*x       - we multiply both sides of the equation by x

891=1.1764705882353*x       - we divide both sides of the equation by (1.1764705882353) to get x

891/1.1764705882353=x 

757.35=x 

x=757.35

now we have: 

85% of 891=757.35

4 0
3 years ago
Read 2 more answers
True or false: when you dilate a figure, the coordinates are multiplied by the scale factor
german

Answer:

True

Step-by-step explanation:

3 0
3 years ago
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