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cluponka [151]
4 years ago
5

-90 times the difference between a number and 83 is equal to the number plus -99

Mathematics
1 answer:
dimaraw [331]4 years ago
7 0

Answer:

x = 83.2

Step-by-step explanation:

Let the unknown number be x

-90 * (x - 83) = x + (-99)

-90x + 7470 = x - 99

Subtract x from both sides

-90x - x + 7470 = x - x - 99

-91x + 7470 = -99

Subtract 7470 from both sides

-91x + 7470 - 7470 = -99 -7470

-91x = -7569

Divide both sides by -91

x = 83.2

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Calculate 12 x 15 by changing the numbers into friendlier numbers as we saw in the videos. Show how you work it out – write out
kondor19780726 [428]

Answer:

The product 12 × 15 in friendlier numbers is (10 + 2) × (10 + 5) = 180

Step-by-step explanation:

The parameter given are;

To 12 × 15 by changing the numbers into friendlier numbers

The product in 12 × 15 written with friendlier numbers (or in a simplified format can be given as follows;

12 × 15 = (10 + 2) × (10 + 5)

Which gives;

(10 + 2) × (10 + 5) = 10² + 10 × 5 + 2 × 10 + 2 × 5

From which we have;

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Answer:

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