Three times the difference of a number and 9 is -3. Find the number

Matthew is training to participate in a half marathon. The table below shows the number of miles he runs in weeks 1 and 2. Week

Maurinko [17]

Matthew ran 14.58 miles in week 3

4 0

2 years ago

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In 1992, South Dakota's population was 10 million. Since then, the population has grown by 1.4% each year. Based on this, when w

ella [17]

Answer:

49.9 years or 50 years later.

At year : 2042

Explanation:

use compound interest formula: $\sf \boxed{ \sf P ( \sf 1 + \dfrac{r}{100} )^n}$

$\rightarrow \s \sf 10( 1 + \dfrac{1.4}{100} )^n = 20$

$\rightarrow \sf ( 1.014) ^n = 2$

$\rightarrow \sf n( ln( 1.014) ) = ln(2)$

$\rightarrow\sf n = \dfrac{ln(2)}{ln( 1.014)}$

$\rightarrow\sf n = 49.8563 \ years$

8 0

2 years ago

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A company is trying out a new marketing technique that begin by asking One customer to tell three friends about a product in the

Nostrana [21]

Week 1 : 1 customer tells 3 friends

Week 2: 3 new customers tell 9 friends

Week 3: 9 new customers tell 27 friends

If w represents number of weeks, then (C) represents the model appropriately. Let's see how:

Putting w = 1 , 2 and 3 in each of the options

(A) 3w: 3 for week 1, 6 for week 2, 9 for week 3 ⇒ INCORRECT

(B) w^3: 1 for week 1, 8 for week 2, 27 for week 3 ⇒ INCORRECT

(C) 3^w: 3 for week 1, 9 for week 2, 27 for week 3 ⇒ CORRECT

(D) 3w^3: 3 for week 1, 24 for week 2, 81 for week 3 ⇒ INCORRECT

Hence, the answer is (C)

5 0

3 years ago

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A red kangaroo jumps along at 40 km/h. At this rate how long would it take to jump 2 km?

LenKa [72]

The solution would be like this for this specific problem:

Given: 40 km/h

2 km

t = d / v
t = 2 km / 40 km/h
t = 0.05 h * 60 minutes = 3 minutes

<span>At this rate, it would take 3 minutes for the red kangaroo to jump 2 km.</span>

7 0

2 years ago

Clarise evaluated this expression. (66.3 – 14.62) ÷ 0.6 – 0.22 (51.68) ÷ 0.6 – 0.22 (51.68) ÷ 0.42 51.68 ÷ 0.16 32.3 Which error

Pepsi [2]

The error she make is the last one 0.1632.3

6 0

3 years ago

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