A. 5/7 × 9/10b. 1 3/5 - 5/6answer these ! : o i need

A. 45/70

5/7 × 9/10

Multiply the numerator with the other numerator, and denominator with the other denominator.

5 × 9
7 × 10

It becomes 45/70.

B. 23/30

1 3/5 - 5/6

In adding/subtracting fractions, their denominators must be equal. Make them so by finding the LCM of both denominators.

5 and 6 would have an LCM of 30. Make it so the numerator and new denominator still have equal proportion as the first fraction you started with.

1 3/5 becomes 1 3(6) / 5(6), or 1 18/30
5/6 becomes 5(5) / 6(5), or 25/30

You can now subtract both fractions.

1 18/30 - 25/30

The minuend (if the presence of 1 whole is ignored) is smaller than the subtrahend. To fix this, borrow the 1 whole from 1 18/30. 1 in this fraction would be 30, so add 30 to the fraction and remove the 1 in the fraction.

48/30 - 25/30

Subtract.

=23/30.

♧

The change in time for the first quarter is  seconds.  = 2.07

The change in time for the second quarter is  seconds. =1.09

The change in time for the third quarter is  seconds. =0.95

The change in time for the fourth quarter is  seconds.=0.81

Explanation:

I just did it on eng.