Mathematical operation and error analysis

Write the formula used to calculate mean absolute error?

What is relative error?

$A^x+A^x=A^{2x}$

$4\times {15}^3-2\times {10}^2$ is 

Find the value of $2\times {10}^{12}+4\times {10}^{10}$.

The number of significant figures are present in $208$ is _____.

Given the number: $161 \mathrm{cm}; 0.161 \mathrm{cm}; 0.0161 \mathrm{cm}$. The number of signification figures for three numbers is:

The number of significant figures are present in $500.0$ is _____.

Students $A,B$ and $\mathrm{C}$ measure the length of a room using $25 \mathrm{m}$ long measuring tape of least count $\mathrm{LC}$ $0.5 \mathrm{cm},$ meter-scale of $\mathrm{LC} 0.1 \mathrm{cm}$ and a foot-scale of $\mathrm{LC} 0.05 \mathrm{cm},$ respectively. If the specified length of the room is $9.5 \mathrm{m},$ then which of the following students will report the lowest relative error in the measured length? $\left(1 \mathrm{foot}=30.48 \mathrm{cm}\right)$

Among the following, the correct statement is :

How many significant figures are present in the following number?

$0.00456$

Represent the following number in scientific notation:

$3068.789$

If the density of a solution is $3.12 \mathrm{g} {\mathrm{mL}}^{-1}$ , the mass of $1.5 \mathrm{mL}$ solution in significant figures is

The radius of a sphere is $1.41\mathrm{ }\mathrm{c}\mathrm{m}$. Its volume to an appropriate number of significant figures is _____ ${\mathrm{cm}}^3$.

How many significant figures are there in each of the following numbers?
${\left(5.56\right)}^2\left(8.24\right)/\left(3.6\right)$

Let $(3.00\times 2.303)+10.00=$Z, so the number of significant figures in Z is -------.

The number $0.004$ has significant figures equal to

The number of significant figure in$0.000320$ is

The answer of the calculation $\frac{2.568\times 5.8}{4.168}$ in significant figures will be