Question

a newborn baby has about 26,000,000,000 cells. an adult has about 4.94×10^13 cells. how many times as many cells does an adult have than a newborn? enter your answer in scientific notation. an adult has about times more cells than a newborn baby.

Explanation:

Step1: Write the number of baby's cells in scientific notation

The number of cells in a newborn baby is 26,000,000,000. In scientific - notation, it is $2.6\times10^{10}$.

Step2: Calculate the ratio of adult's cells to baby's cells

We want to find out how many times more cells an adult has than a baby. We divide the number of adult's cells by the number of baby's cells. Let $A = 4.94\times10^{13}$ (number of adult's cells) and $B = 2.6\times10^{10}$ (number of baby's cells). The ratio $r=\frac{A}{B}=\frac{4.94\times10^{13}}{2.6\times10^{10}}$.
Using the rule of exponents $\frac{a\times10^{m}}{b\times10^{n}}=\frac{a}{b}\times10^{m - n}$, we have $\frac{4.94}{2.6}\times10^{13 - 10}$.
$\frac{4.94}{2.6}=1.9$, and $13-10 = 3$. So $r = 1.9\times10^{3}$.

Answer:

$1.9\times10^{3}$