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Westkost [7]
3 years ago
8

Write 0.0000000068 as a scientific notation

Mathematics
1 answer:
Y_Kistochka [10]3 years ago
3 0

Answer:

10×6.8 to the 9th power

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Solve the simultaneous equations<br> 3x + y = 25<br> 2x – y = 10
Darina [25.2K]

Answer:

x=7 and y=4

Step-by-step explanation:

I will use the elimination method:

Since the co-efficient of both y's are the same number but different signs we add the 2 equations to eliminate the y:

3x + y =25
+     +     +

2x - y = 10

Simplify:

5x=35

Divide both sides by 5:

5x÷5=35÷5

Simplify:

x=7

Substitute this into either equation 1 or 2 ( I chose 1):

3(7) + y = 25

21 + y = 25

Subtract 21 from both sides and simplify to get y:

21+y-21=25-21

y=4

Therefore x=7 and y=4

4 0
3 years ago
Two step equations
Llana [10]

28 each book 155-15=140 and then 140÷5=28

6 0
3 years ago
Geometric mean of 12 and 16
Leviafan [203]
The answer is approximately 13.8564.
6 0
4 years ago
PLEASE HELP!!
Contact [7]

Answer:

6 cm

Step-by-step explanation:

Let k represent the scale factor between ΔABC and ΔDCA. Then ...

... CA = k·BC

... AD = k·CA

So, AD/BC = k·(k·BC)/BC = k² = 9/4

Then k = √(9/4) = 3/2, and ...

... CA = (3/2)·BC = (3/2)·(4 cm)

... CA = 6 cm

4 0
4 years ago
02, 10:34:11 PM
lakkis [162]

Answer:

23

Step-by-step explanation:

I don't know j subtract 18 from 41

7 0
3 years ago
Read 2 more answers
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