(2) An international call to a certain country costs Rs. 7 for the first minute, and Rs. 4 per minute thereafter.
Write down an expression in rupees for the cost of
a 10 minutes long international call. Simplify your
expression

Step-by-step explanation:

Given

per minute

Required

Determine the cost of a 10 minutes call

First, we need to determine the expression for the call charges.

Let:

The relationship between x and y is:

i.e.

1 is subtracted from the total minutes because the first minute has a fixed rate.

For a 10 minutes call

Hence, the charges for a 10 minutes call is: Rs.43

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation:

find the magnitude of the trig term  

csc

(

x

)

−

1

by taking the absolute value of the coefficient.

1

find the lower bound of the range.

tap for more

y

=

−

2

find the upper bound of the range.

tap for more

y

=

0

the range is  

y

≤

−

2

or  

y

≥

0

.

(

−

∞

,

−

2

]

∪

[

0

,

∞

)

{

y

|

y

≤

−

2

,

y

≥

0

}

step-by-step explanation: