Step-by-step explanation:
y = x + 7
Using the substitution method,
-2x - 11 = y
-2x - 11 = (x + 7)
3x = -18
x = -6.
y = (-6) + 7 = 1.
The solution pair is (-6,1).
11/7 = x/13
x = 13*11/7 ≈ 20.4 ← <span>to the nearest tenth</span>
Answer:
7892 dolphins
Step-by-step explanation:
let P denote the dolphin population.
-Notice this is an exponential decay and is denoted as:
Where;
- is the population at time t
- t is the time
- r is the rate of decay or decrease in population
- is the initial population size.
#Given t=30yrs, =20000 and r=3.1%, the population after 30 years is estimated as:
Hence, the dolphin population after 30yrs is approximately 7892
Answer:
- 8x² + 36xy - 36y²
Step-by-step explanation:
Given
(- 2x + 6y)(4x - 6y)
Each term in the second factor is multiplied by each term in the first factor, that is
- 2x(4x - 6y) + 6y(4x - 6y) ← distribute each parenthesis
= - 8x² + 12xy + 24xy - 36y² ← collect like terms
= - 8x² + 36xy - 36y²
Answer:
1155
Step-by-step explanation:
165 × 7 = 1155
i hink this is the answert