Remember
difference of 2 perfect squares
a^2-b^2=(a-b)(a+b)
(x)^2-(7)^2=(x-7)(x+7)
set to zero
x-7=0
x=7
x+7=0
x=-7
x=-7 or 7
The first thing we need to know is that the Jennifer-Chelsea ratio is as follows:
3: 2
Equivalently:
3/2
To know how much Jennifer invests, we have to:
(3 / (2 + 3)) = x / 125000
Clearing x:
x = 125000 * (3 / (2 + 3)) = 75000
answer
Jennifer invest 75000 $
Step-by-step explanation:
i think its 4.2m^2+1.5n
I honestly have no idea but just wait it out.
Answer:
C
Step-by-step explanation:
Given the inequality
(x - 3)(x + 5) ≤ 0
Find the zeros by equating to zero
(x - 3)(x + 5) = 0
Equate each factor to zero and solve for x
x - 3 = 0 ⇒ x = 3
x + 5 = 0 ⇒ x = - 5
Thus the domain is split into 3 intervals
--------------------------------------------------------------
- ∞ < x ≤ - 5 → (1)
- 5 ≤ x ≤ 3 → (2)
3 ≤ x < + ∞ → (3)
Select a test point in each interval and check validity
x = - 10 → (- 13)(- 5) = 65 > 0 ← not valid
x = 0 → (- 3)(5) = - 15 < 0 ← valid
x = 10 → (7)(15) = 105 > 0 ← not valid
Solution is { x | - 5 ≤ x ≤ 3 }
