Four more than a number is more than 13

4+x>13

x>9

Step-by-step explanation:

This statement represents an inequality. To solve for the missing number first write out the inequality algebrically.

"Four more" implies that 4 is being added to the number. Another way to "a number" is to use the variable, x. So, the left side of the inequality is 4+x. Then, it says that this is "more than" 13. Thus, the greater than sign, >, should be used. This means that the final inequality is 4+x>13.

Next, you can solve the inequality by subtracting 4 from both sides. This gives  x>9.

the answer is b.

64

step-by-step explanation:

c=2πr=2·π·8≈64