Answer:
BD measures 20 units.
Explanation:
We are given that Point C is on the line segment BD, where:
![BD = 5x, BC = 4x \text{ and } CD = 4](https://img.qammunity.org/2022/formulas/mathematics/high-school/7sq4mdidahye0x3g85hxfua1j6sshfwqfx.png)
And we want to determine the numerical length of BD.
Since C is somewhere on BD, BD is the sum of BC and CD:
![\displaystyle BD = BC + CD](https://img.qammunity.org/2022/formulas/mathematics/high-school/2y4b03f2zfqmpzgz37jmiju6ow3kacc6jj.png)
Substitute:
![(5x) = (4x) + (4)](https://img.qammunity.org/2022/formulas/mathematics/high-school/2z6p7fspf49sf5mx5qua4ghibhabg4vjc2.png)
Solve for x. Subtract:
![x = 4](https://img.qammunity.org/2022/formulas/mathematics/college/4nt3bl1ru0u6oqegubg3lpl4odct3m3sp3.png)
Hence, the value of x is 4.
BD is given by 5x. Therefore:
![BD = 5(4) = 20\text{ units}](https://img.qammunity.org/2022/formulas/mathematics/high-school/k9afvkhl3h5p0m5zwas342hkf2w1c47wwt.png)
In conclusion, BD measures 20 units.