What is this number in standard form? 6.8 x 10 –4?

To multiply a number by 10^-4, move the decimal place to the left four place values.
Final 0.00068

The answer is =0.00068. 6.8 move the decimal point back -4 places to get the number

What are the options

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)