3 years ago

Explain how an estimate helps you to place the decimal point when multiplying 3.9x5.3

Mathematics

1 answer:

Pepsi [2]3 years ago

5 0

When you estimate, you round the decimal up.3.9 rounds up to 4 ,5.3 rounds up to 5.

4 times 5 equals 20.The actual answer is 20.67.

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Work out the value of x.

Vinil7 [7]

Answer:

$\huge\boxed{x=20}$

Useful Information:

Co-interior angles add to 180°

Step-by-step explanation:

The first step is to add 4x to 5x, which gives you 9x. This is because co-interior angles add up to 180, so 4x+5x=180. Co-interior angles can be spotted by their C shape.

To work out the value of x you would need to divide 180 by 9, which gives you 20°. This is because 9x is equal to 180. This means that x is equal to 180 divided by 9.

1) Add 4x to 5x.

$4x+5x=9x$