The entrance of a building is controlled by a code device (box), which has 10 numbers and 4 letters. A code has four elements: two digits and two letters in any order. The two letters must be distinct. How many possible codes is there ?

0.85 or 85%

step-by-step explanation:

1) divide 23 by 27

2) round the decimal to the nearest 10

3) so your answer would be 0.85 or 85%

the answer would be 1 1/72

step-by-step explanation:

you can rewrite the equation by separating the parts and then solving individually:

10-9=1

1/8 - 1/9=

find l c d and then combine:

1 1/72

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step-by-step explanation: