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Please explain how to multiply two exponential expressions

In the multiplication of exponential expressions, only exponents are added given that the expressions share the same base. If this is not the case, the expression remains the same or can be simplified. Hence...
AM
Answered by Alvaro M. • Maths tutor
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Explain why water molecules form on average two hydrogen bonds per molecule, whereas ammonia molecules (NH3) form only one.

A hydrogen bond requires both a lone pair of electrons on a O, N or F atom and a hydrogen atom. In water there are two lone pairs and two hydrogen atoms, allowing the formation of two hydrogen bonds. In ammo...
Answered by • Chemistry tutor
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Explain why there has been a large increase in antibiotic-resistant strains of bacteria.

An overuse of antibiotics means the non-resistant strains are killed, leaving less competition for the resistant-strains of bacteria, so they can mutate to reproduce more resistant strains of bacteria.
AM
Answered by Anna M. • Biology tutor
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Solve the following simultaneous equations: 2x - 3y = 16, x + 2y = -6

First we label the two equations as (1) and (2):2x - 3y = 16 (1)x + 2y = -6 (2)We want both equations to have the same number before one of the variables so the easiest way is to multiply equation (2) by two...
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Answered by Tutor401319 D. • Maths tutor
5552 Views

describe how kidneys filter blood?

Kidney filters blood via ultrafiltration filters small particles of blood out such as sugar salts water and urea. Large particle such are red blood cells and white blood cells stay in blood. Filtrate moves i...
AS
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