Find the area of the triangle with base 30 cm and height 15cm.

The eccentricity of an ellipse whose centre is at the origin is If one of its directrices is then the equation of the normal to it at is

Find the mean absolute deviation of the given numbers: 6,10,3,3,5,8,6,2

Use counter to add -5 + 2, where is + and  Is –
Start with: 
You add: 
Which picture shows the sum:

The line is a normal to the ellipse is

While drawing the map of USA, Jassica represented the distance between two cities as 2cm there the actual distance is 100km. What is the scale of the map.

Height of 5 students in a classroom are 125 cm,134 cm, 157 cm,110 cm,146 cm.
Find the range of height

These are the first eight ionization energies for a particular neutral atom. All values are expressed in MJ mol^-1. How many valence electrons do/does this atom possess?

1st	2nd	3rd	4th	5th	6th	7th	8th
1.31	3.39	5.30	7.47	10.99	13.33	71.33	84.01

Teacher tells the Class that highest marks obtained by student in her class is twice the lowest marks plus 7 . The highest score is 87 . What is the lowest score?

Polly is measuring the temperature of different chemical mixture. The temperature of two mixtures are shown in table as

Which mixture has highest absolute value

Which of the following represents x  4

Janier earns a profit of $2a every day How much money will she earn at a profit at the end of 4 days.

In a classroom then are 45 students in which 30 are boys are rest are female, find the ratio of number of girls to the number of boys.

Find the area between the two concentric circles of radius 3cm and 4cm.

Which of the following is correct:

Lawren has $1000 in a saving account. He wants to save at least $400 before winter. He withdraws $50 every week for daily requirements. Write an inequality that represents Lawren’s situation.

For such questions, we have to see which quantity is constant and variable. We have be careful about the words like “at least”, “at most”, etc.