On which interval is the function increasing?
a (-∞-1)u(0,1)
b (-1,0)u(1,∞)
∞,-1)u(1,-∞)
,-1)u(1,∞)

b.

Step-by-step explanation:

The graph can be divided into 4 regions.

Region 1 is for

Region 2 is for

Region 3 is for

Region 4 is for

So, for the region 1, the values of goes on decreasing with increasing . Therefore, the function is decreasing in the interval .

Now, for the region 2, the values of increases with increasing . So, the function is increasing in the interval .

For the region 3, the the values of goes on decreasing with increasing . Therefore, the function is decreasing in the interval .

Now, for the region 4, the values of increases with increasing . So, the function is increasing in the interval .

Therefore, regions 2 and 4 are the regions when the function is increasing.

Hence, the correct option is b.

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500

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step-by-step explanation:

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