7. √100 - √64 = (a) 2 (b) 4 (c) 6 (d) 8 8. a circle has a diameter of 6, and a circumference of c unit b +…

Explanation:

Step1: Calculate square - roots

Find the square - root of 100 and 64. We know that $\sqrt{100}=10$ and $\sqrt{64} = 8$.

Step2: Subtract the results

Subtract the two square - root values: $10−8=2$.

Answer:

A. 2

Explanation:

Step1: Recall the formula for the circumference of a circle

The formula for the circumference of a circle is $c=\pi d$, where $d$ is the diameter. Given $d = 6$, then $c=\pi\times6 = 6\pi$. Since the problem seems to be incomplete (no value for $b$ is given), assuming $b = 3\pi$ (if we consider some related context where $b$ and $c$ are parts of a combined value related to circle measurements), then $b + c=3\pi+6\pi=9\pi$.

Answer:

A. $9\pi$