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The difference of a number and 6 is the same as 5 times the sum of the number and 2. What is the number?
Analysis of a hydrocarbon showed that 7.8 g of the hydrocarbon contained 0.6 g of
hydrogen and that the relative molecular mass was 78. Find the molecular formula of the
hydrocarbon
Use the matrix method (together with elementary row transformations) to solve the following:
2x −y +3z = 2
x +2y −z = 4
−4x +5y +z = 10
A small plastic sphere is charged to -10 nC. It is held 1.0 cm above a small glass bead at rest on a table. The bead has a mass of 15 mg and a charge of +10 nC. Will the glass bead “leap up” to the plastic sphere?
You are preparing soft maize porridge at home using the following procedure: 1) the maize meal is suspended in cold water, 2) it is added to a pan with boiling water and brought to the boil, 3) it is cooked on the stove for 20 minutes while stirring continuously, 4) after cooking the porridge is removed from the stove and cooled to room temperature, 5) it is then stored it the refrigerator until the next day. Explain the chemical, physical and viscosity changes that starch in the maize meal and porridge undergoes during each stage of the process
According to a report from the research for Studying Health System Change, 20% of South Africans delay or go without medical care because of concerns about cost. Suppose that 8 individuals are randomly selected. (a) What is the probability that two individuals will delay or go without medical care? (2) (b) What is the probability that at most two individuals will delay or go without medical care? (3) (c) What is the probability that at least seven individuals will delay or go without medical care? (3)
1. In the context of choosing a "whole", explain when a "fifth is not always equal to a "fifth". Give an example.
2. Use the number 73 562 to the nearest multiple of 1 000
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sipho has a piece of string that is exactly 3m long. He want to divide it equally among 3 friends. illustrate with the number line what each of the string will each one receive
Arrange the following iso-electronic species in order of decreasing atomic radius. Na+
Mg2+, Al3+, Si4+, N3-
, 02-
, F, Ne
#339914 on Dec 2023