4
-8 + b = 4 add 8 to both sides: b = 12
b = 12 12(3)+3 = 39, use a calculator to find out
1.5
5b = 8 therefore b = 8/5 therefore b = 1.6
a+b+c+d+e = 30 (i) c+e = 14 (ii) d+b = 1 (iii) a = 2b-1 (iv) a+c = 10 (v) By (i)-(ii)-(iii): a = 15 then, by (iv): b = 8 and by (v): c = -5 Also, b = 8 so by (iii): d = -7 and then by (i), e = 19
12
Addition is commutative. That is, a + b = b + a for all a, b
-8 + b = 4 add 8 to both sides: b = 12
3b+4 = b+12 3b-b = 12-4 2b = 8 b = 4
B=61
in order to solve this problem you have to solve for x first wich you are given the data to pre forme so x=4 and x.2=8 and 8=y and y-4=4=a=x so a+8=12 and 12=b
b = 12 12(3)+3 = 39, use a calculator to find out
12 = -4/2 * -2 + b 12 = -2 * -2 + b 12 = 4 + b 8 = b
5b = 8 b = 8/5 or 1.6
12 = -4/7 * -2 + b 12 = 8/7 + b 10 6/7 = b
Evaluate -4(a+b) - 10a/b when a=8 and b=5
b= 4