Step-by-step explanation:

in 2nd exp. this is because by using the formula of a2-b2
For this case, the first thing we must do is define a variable.
We have then:
x: number of muffin plates
We now write the expression that models the problem.
We know there are 4 muffins in each dish, therefore, we have:

Substituting for x = 0 we have:
Answer:
There are 0 lemon muffins
d: 0
The corresponding angles and sides are congruent.
Answer:
Area = 153.8 cm/ m
Step-by-step explanation:
Area of circle = 22 ÷ 7 × r²
= 22 ÷ 7 × (7²)
= 22 ÷ 7 × 49
= 3.14 × 49
= 153.8 cm/ m