D, because we already know how much he spent in total so it isnt B, trust me its D
Answer:
=0.4
Step-by-step explanation:
1/3= 0.33
5/6=0.83
Then: 0.33/0.83 = 0.4
You can also do 6/15 which results from (1*6)=6 and (3*5)=15
Answer:
n = 43 samples
Step-by-step explanation:
Error margin, E = 0.15
Confidence Interval, CI = 95% = 0.95
Significance level, α = 1 - 0.95
α = 0.05
α/2 = 0.025
To calculate population proportion, the sample size formula is:
n = 0.25 [(Zα/2) /E]²
Zα/2 = Z₀.₀₂₅ = 1.96
n = 0.25 * [(Z₀.₀₂₅)/E]²
n = 0.25 * [1.96/0.15]²
n = 42.68
n = 43 samples
Answer:
(4x-1)(4x-1)
(x-6)(x+5)
(3x-7)(3x+7)
(3x-1)(x+6)
Step-by-step explanation:
yes
Answer:
x = 1 ± √89
Step-by-step explanation:
Step 1: Expand
x² - 2x - 63 = 25
Step 2: Isolate xs
x² - 2x = 88
Step 3: Complete the square
x² - 2x + 1 = 88 + 1
(x - 1)² = 89
Step 3: Square root both sides
√(x - 1)² = ±√89
x - 1 = ±√89
Step 4: Isolate x
x = 1 ± √89