Identify the problem with negative numbers as its answer:

(-2) x −(-9) =_____

The numerical co-efficient of −7mn is

If Mani buys 5kg of potatoes for Rs.75 then he can buy ______kg of potatoes for Rs.105.

The sum of all angles at a point is

____\(\times \) 75 = 0

The addition of −7b and 2b is __________

If a = 5, the value of 2a + 5 is _____

A car travels 60 km with 3 liters of petrol. If the car has to cover the distance of 200 km, it requires _______ liters of petrol.

Draw a tetromino which passes symmetry __________

(-45) - (-8) = (-8) - (-45)

The sum of two integers can never be zero

The co-efficient of ab in the term 15 abc is 15.

If x is a natural number, then x + 1 is its predecessor.

Number of students in a hostel and consumption of food are not in direct proportion.

Add the following
(i) 8 and –12 using number line
(ii) (–3) and (–5) using number line
(iii) (-100 + (-10)  
(iv) 20 + (-72)
(v) 82 + (-75) 
(vi) -48 + (-15)
(vii) -225 + (-63)

If P = -15 and Q = 5 find (P-Q) + (P+Q)

The price of an item x increases by Rs. 10 every year and an item y decreases by Rs. 15 every year. If in 2018, the price of x is Rs. 50 and y is Rs. 90, then which item will be costlier in the year 2020.

The area of a rhombus is 100 sq. cm and length of one of its diagonals is 8 cm. Find the length of the other diagonal

If x = 2 and y = 3, then find the value of the following expressions
(i) 2x − 3y
(ii) x + y
(iii) 4y − x
(iv) x + 1 − y

Add:
(i) (–70) and (–12)
(ii) 103 and 39.

A parallelogram has adjacent sides 12 cm and 9 cm. If the distance between its shorter sides is 8 cm, find the distance between its longer side

If x = 3, y = 2 find the value of
(i) 4x + 7y
(ii) 3x + 2y − 5
(iii) x − y

If \(\angle\)POQ = 23° and \(\angle\)POR = 62° then find \(\angle\)QOR

A telephone exchange worker wants to give the telephone connection to Amutha's house. Shows all the possibilities of cable connections. Find the route which requires minimum cable?

Find the value of :
(i) (-11) - (-33) 
(ii) (-90)-(-50)

Simplify:100x + 99y – 98z + 10x + 10y + 10z – x – y + z

Construct bisector of the ∠ABC with the measure 80°.