Answer:
-21
Step-by-step explanation:
positive 54 decreased negative 75. The answer is -21. why? Because the negative variables is higher than the positive variable in the given.
129
+54- -75
54+75=129
When you are subtracting 54- -75, the symbols will automatically change to postives.
You could also use the method:
Keep, change, change
54 + +75
Q2. mean [ with 140 in place is] = 436/ 6 = 72 and 2/3rds.
mean [without 140 in place = 296/5 = 59.2
that means the mean would definitely decrease.
will get back to you in a moment.
7,14,21,28,35,42,49,56,63,70
18,36,54,72,90,108,126,144,162,180
x = 10°; Angle A = 84°
Angle A + Angle B = 180
5x + 34 + 2x + 76 = 180
7x + 110 = 180
7x = 70
x = 10
Angle A: 5(10) + 34 = 50 + 34 = 84°
