Answer:
Step-by-step explanation:
42) 9/4 = 2/x
You can solve it by cross multiplication:
In cross multiplication the numerator of first expression will be multiplied by th denominator of 2nd expression and the numerator of second expression will be multiplied by the denominator of 1st expression.
So,
9/4 = 2/x
9*x = 2*4
9x=8
Divide both the sides by 9
9x/9 = 8/9
x= 8/9
44) -3/8 = r/3
Perform cross multiplication:
-3 *3 = 8* r
-9=8r
Divide both the sides by 8
-9/8 = 8r/8
-9/8 = r
46) -9/2n = -5/7
Perform cross multiplication:
-9 * 7 = 2n* -5
-63= -10n
negative signs will be cancelled out by each other.
63= 10n
Divide both the sides by 10
63/10 = 10n/10
63/10 = n ....
