Answer:
57.1
Step-by-step explanation:
Perimeter Formula: P = 2l + 2w
Simply plug in what we know and solve:
269.4 = 2l + 2(77.6)
269.4 = 2l + 155.2
114.2 = 2l
l = 57.1
6+ 4×whatever y equals +9
Answer:
r=12
Step-by-step explanation:
Look, we can reverse the problem to get 23-11=r. This means that r=12.
Differentiating both sides of

with respect to <em>x</em> yields (using the chain rule)

Solve for d<em>y</em>/d<em>x</em> :

The answer is then D.
Answer:

Step-by-step explanation:

Step 1: Open the brackets

Step 2: Bring the similar variables together

Step 3: Simplify by adding/subtracting the coefficients of the similar variables

Step 4: Rearrange as required.