Answer:
Step-by-step explanation:
P = £1100
r = 5%
t = 6 years
I =P*r*t
Amount = P + I = 1100 + 330 = £1430
Answer:
24.2$
Step-by-step explanation:
10％ are 0.1 as a decimal
22$ are actually 100％ so its a 1.0 as a decimal
so the new price is 110％, 1.1 as a decimal
22$*1.1＝24.2$
Y = 42.5x + 45.....for 5 hrs.....x = 5
y = 42.5(5) + 45
y = 212.50 + 45
y = 257.50 <===
1. x² + 8x + 16
x² + 4x + 4x + 16
x(x) + x(4) + 4(x) + 4(4)
x(x + 4) + 4(x + 4)
(x + 4)(x + 4)
(x + 4)²
The answer is A.
2. x² + 4x = 12
x² + 4x + 4 = 12 + 4
x² + 4x + 4 = 16
x² + 2x + 2x + 4 = 16
x(x) + x(2) + 2(x) + 2(2) = 16
x(x + 2) + 2(x + 2) = 16
(x + 2)(x + 2) = 16
(x + 2)² = 16
√(x + 2)² = √16
x + 2 = ±4
- 2 - 2
x = -2 ± 4
x = -2 + 4 or x = -2 - 4
x = 2 or x = -6
The answer is B.
3. x² + 9x + 4 = 0
Δ = b² - 4ac
Δ = (9)² - 4(1)(4)
Δ = 81 - 4(4)
Δ = 81 - 16
Δ = 65
THe answer is C.
4. x² - 6x - 7 = 0
Δ = b² - 4ac
Δ = (-6)² - 4(1)(-7)
Δ = 36 - 4(-7)
Δ = 36 + 28
Δ = 64
The answer is A.
