Top answers

Simplify, leaving your answer as a quadratic: (2x + 3)/(x+4) - (3x - 6) = 4

(2x + 3)/(x+4) - (3x - 6) = 4 Initial equationTimes all terms by (x + 4) (2x + 3) - (3x - 6)(x + 4) = 4 (x + 4)Multiply out the brackets (2x + 3) - (3x 2 + 12x - 6x - 24) = 4x + 16Remove from brackets by fac...
AO
Answered by Anya O. • Maths tutor
4075 Views

A quarter circle has a radius of 6 cm. Calculate the area of the quarter circle.

It is very easy to calculate the area of the whole circle and divide it by 4.The area of the whole circle can be calculated using the formula A = pi r 2 , where r is the radius of the circle and pi has a val...
AD
Answered by Ana D. • Maths tutor
10524 Views

What is the mass percentage of carbon in a CO2 molecule?

First we need to calculate the total mass of a CO 2 molecule. This is done by summing up the individual masses of all the atoms. To find these, we look at the periodic table and see that the masses are C: 12...
AD
Answered by Ana D. • Chemistry tutor
6365 Views

Ionic compounds have high melting points: Explain why and explain why Calcium Oxide has a higher melting point than Lithium Chloride

Ionic compounds are formed when electrostatic attractions form between oppositely charged ions. These attractions are strong and so require a large amount of energy to break. This energy is provided in the h...
SM
Answered by Sam M. • Chemistry tutor
26932 Views

Name and describe the process that leads to air entering the lungs

This process is called Ventilation and is a required step in aerobic respiration.This process starts with the diaphragm contracting, one also sees the (external) intercostal muscles contract. These contracti...
SM
Answered by Sam M. • Biology tutor
3206 Views