Answer:
51
Step-by-step explanation:
Answer:
Slope = (Y2 -Y1) ÷ (X2 -X1)
Slope = (0 -0) / (-5, -7)
Slope = 0 / -12 = 0
The slope of the line is zero. It is perfectly horizontal.
Step-by-step explanation:
Answer:
see explanation
Step-by-step explanation:
Given A is directly proportional to r² then the equation relating them is
A = kr² ← k is the constant of proportion
To find k use the condition when r = 5, A = 75 , then
75 = k × 5² = 25k ( divide both sides by 25 )
3 = k
A = 3r² ← equation of proportion
(a)
when r = 4, then
A = 3 × 4² = 3 × 16 = 48
(b)
when A = 147 , then
147 = 3r² ( divide both sides by 3 )
49 = r² ( take the square root of both sides )
r =
= 7