15 = ½ (7x-6)
distribute ½ into parentheses
15 = ½(7x) - ½(6)
15 = ⁷/₂x - 3
multiply by 2
30 = 7x -6
subtract +6 to both side
30 + 6 = 7x
36 = 7x
devide 7 to both side
36
------ = x
7
Answer: 4.012
Step-by-step explanation: Hope this helps! :)
You did a simple mistake by forgetting to add 4 to itself in the square root. (-4^2=16)
x=(4 +/- sqrt(16-8))/4
x=(4 +/- sqrt(8))/4
Is this enough to get you started again?
A way you can set this up is like this.
1 / 2.75 = x / 3.66667
Solve for x by cross multiplying
x = 1.333
or
1 and 1/3 cups
Answer:
A
Step-by-step explanation:
The area (A) of a rhombus is calculated as
A =
product of diagonals
Here AC = 13 and BD = 15 are the diagonals, hence
A = 0.5 × 13 × 15 = 97.5 units² → A