To find the intersection points, you take x^2 - 4x + 9 = -2x + 17
This gives x^2 - 2x - 8 = 0,
which factorises to (x - 4)(x + 2) = 0, giving the solutions x = 4 or x = -2
From the graph, we can see that x is positive, meaning x = 4, so a = 4.
Substituting x = 4 into y = -2x + 17, we get y = -2(4) + 17 = 9, so b = 9.
a + b = 4 + 9 = 13. The answer is B.
Answer:
x = 2
Step-by-step explanation:
-4(3 - 2x) + 2x = 2 x 4
-12 + 8x + 2x = 2 x 4
-12 + 8x + 2x = 8
-12 + 10x = 8
-12 + 12 + 10x = 8 + 12
10x = 20
x = 2
Answer:
900π
Step-by-step explanation:
surface area of a sphere: 4πr²
=> 4 × π × 15²
=> 900π
1/5 is equal to 0.2, which is also equal to 20%
