High School

22. It takes Mang Fredie one hour to dig a hole in a rock that is 1.2 feet wide, 1.68 feet long, and 0.8 feet deep. How long will it take Mang Fredie to dig a hole in the same rock texture that is 2.4 feet wide, 3.36 feet long, and 1.6 feet deep?

A. 8 hrs
B. 6 hrs
C. 4 hrs
D. 3 hrs

---

23. What is the value of [tex]$99^3 + 3(99^2) + 3(99) + 1$[/tex]?

A. 9331
B. 1000
C. 9000
D. 1000000

---

24. Find the value of [tex]$625^2 - 375^2$[/tex].

A. 302500
B. 250000
C. 332225
D. 375550

Answer :

Certainly! Let's solve the expression [tex]\(99^3 + 3(99^2) + 3(99) + 1\)[/tex] step-by-step.

This expression can be viewed as the expansion of a binomial expression [tex]\((a + 1)^3\)[/tex], where [tex]\(a = 99\)[/tex]. Let's break it down into its components:

1. Calculate [tex]\(99^3\)[/tex]:
[tex]\[
99^3 = 99 \times 99 \times 99 = 970,299
\][/tex]

2. Calculate [tex]\(3 \times 99^2\)[/tex]:
[tex]\[
99^2 = 99 \times 99 = 9,801
\][/tex]
[tex]\[
3 \times 99^2 = 3 \times 9,801 = 29,403
\][/tex]

3. Calculate [tex]\(3 \times 99\)[/tex]:
[tex]\[
3 \times 99 = 297
\][/tex]

4. Include the constant term:
[tex]\[
+1 = 1
\][/tex]

5. Add all the components together:
[tex]\[
970,299 + 29,403 + 297 + 1 = 1,000,000
\][/tex]

So the value of the expression [tex]\(99^3 + 3(99^2) + 3(99) + 1\)[/tex] is 1,000,000.