Question

What are some expressions that have a value of 10 when of s=15.

a. s/5 + 7
b. 30 : s
c. (375 : s)-15
d. s²-215
e. 2s+3

Answer 1

Expressions (a) s/5 + 7, (c) (375 : s) - 15, and (d) s² - 215 result in a value of 10 when s = 15, while expressions (b) 30 : s and (e) 2s + 3 do not.

Step-by-step explanation:

The goal is to find expressions that have a value of 10 when s=15. Let's evaluate each expression given in the question:

1. s/5 + 7: Here, we divide s by 5 and then add 7. When s = 15, (15/5) + 7 = 3 + 7 = 10, which meets the requirement.
2. 30 : s: The colon represents division. Thus, 30 divided by s. If s = 15, then 30 : 15 = 2, which does not equal 10.
3. (375 : s) - 15: First, divide 375 by s, then subtract 15. For s = 15, (375 : 15) - 15 = 25 - 15 = 10, which satisfies the condition.
4. s² - 215: This means s squared minus 215. Substituting s = 15, we get (15²) - 215 = 225 - 215 = 10, again satisfying the condition.
5. 2s + 3: This is twice s plus 3. If s = 15, then 2(15) + 3 = 30 + 3 = 33, which is not equal to 10.

Thus, expressions (a), (c), and (d) are correct, as they yield a value of 10 when s is equal to 15.