Answer:
r1 =6
r2 =8
t = ?
[(1/r1) * t] + [(1/r2)*t] = 1
t/6 + t/8 = 1
multiply by common denominator... 24
24 (t/6 + t/8 = 1)
4t + 3t =24
7t = 24
t = 24/7 = 3.4hrs
Answer:
$67.52
Step-by-step explanation:
You can write it as -4/100, or even -2/50, as well as -1/25!
Check the picture below.
so we really have 2 equal triangles with 3 rectangles, so let's get the area of each and sum them up.
![\stackrel{\textit{two equal triangles}}{2\left[ \cfrac{1}{2}(8)(6) \right]}~~+~~\stackrel{back}{(6\cdot 4)}~~ +~~\stackrel{bottom}{(8\cdot 4)}~~+~~\stackrel{top}{(10\cdot 4)}\implies 144](https://tex.z-dn.net/?f=%5Cstackrel%7B%5Ctextit%7Btwo%20equal%20triangles%7D%7D%7B2%5Cleft%5B%20%5Ccfrac%7B1%7D%7B2%7D%288%29%286%29%20%5Cright%5D%7D~~%2B~~%5Cstackrel%7Bback%7D%7B%286%5Ccdot%204%29%7D~~%20%2B~~%5Cstackrel%7Bbottom%7D%7B%288%5Ccdot%204%29%7D~~%2B~~%5Cstackrel%7Btop%7D%7B%2810%5Ccdot%204%29%7D%5Cimplies%20144)
Answer:
x= 7, the number is 7
Step-by-step explanation:
4x-9= 19
4x=28
x=7