Understanding inequality signs

Q.

The function ‘t’ which maps temperature in degree Celsius into temperature in degree Fahrenheit is defined by.

Find (i) t (0) (ii) t (28) (iii) t (–10) (iv) The value of C, when t(C) = 212

Q. Jonas removes his coat when the temperature is above 23 degree Celsius (C). If t is the temperature, when Jonas wears his coat, then which of the following inequalities represent the given situation?

1. $t\le 23$
2. $t>23$
3. $t<23$
4. $t\ge 23$

Q. Christine wears her thermal coat when the temperature is colder than $-4$ ${(}^{\circ }C)$. If $T$ is the temperature in ${(}^{\circ }C)$ at which Christine wears her winter coat, which of the following inequalities best models the situation?

1. $T<-4$
2. $T<4$
3. $T>-4$
4. $T\ge 4$

Q. Which of the following inequalities represent the statement - ' k cannot exceed 5' ?

1. $k\le 5$
2. $k>5$
3. $k<5$
4. $k\ge 5$

Q.

Find the value of