96 messages .... $4.80
155 messages .... x
x= (155x4.80):96=7.75
Answer:
(½x+½y)²=6
Step-by-step explanation:
x^2 + y^2 = 14, xy=5
(A+B)^2=A^2 +2AB+B^2... (*)
(1/2x+1/2y)^2 =(*)
(1/2x)^2 +2(1/2x)(1/2y)+(1/2y)^2 =
1/4x^2 +1/2xy+1/4y^2=
1/4(x^2 +y^2) +1/2(xy)=
1/4*14+1/2*5=
14/4+5/2=
14/4+10/4=
24/4=6
46/8=5.75
Round up to 6, since you can't buy 3/4 of a pack of cookies.
The answer is 6 packs of cookies.
Hope this helps :)
Answer:
Step-by-step explanation:
hello :
9^4 = (3^2)^4
9^4 =3^8
9^4 =(3^4)^2 = 81^2
