Hello :
<span>Factor completely. a^2 - 25b^2 :
a²-25b²=a²-(5b)² = (a-5b)(a+5b)</span>
2. d
3. c
4. a
5. a
6.
7. a
8. c
9. c
10. b
11. d
12. can’t read
13. a
14. c
15. b
16. can’t read
17. b
18. can’t read
19. c
20. c
No because the cost to ship a video game starts at 4.85 but if it were to start at zero than I would because it consistently adds 39.99.
Answer:
25 students take both subjects.
Step-by-step explanation:
Solve for 60% of 300 students:
60/100 = x/300
Cross multiply:
60 × 300 = 100 × x
18000 = 100x
Divide both sides by 100:
180 = x
Solve for 20% of 300 students:
20/100 = x/300
20 × 300 = 100 × x
6000 = 100x
60 = x
Solve for the percentage of students in chemistry:
x/100 = 35/300
x × 300 = 100 × 35
300x = 3500
x = 11.66666...7
x = about 11.7%
Find the difference in percentages:
100 - 60 - 20 - 11.7
8.3
8.3% take both subjects
Solve for 8.3% of students:
8.3/100 = x/300
8.3 × 300 = 100 × x
2490 = 100x
24.9
About 25 students
Check your work by adding all the students together (to get to 300):
25 + 60 + 180 + 35
300 students total
This is correct!
Whenever we divide a certain number by 10 or 100 or 1000... the decimal point of the number always moves to your left hand side.
for example: 25 or 25.00 is a number that has its decimal point after 5.
suppose we divide it by 10, the decimal point point moves as number of times as the number of zeros in the divisor. here, 10 has 1 zero. isn't it?
hence, decimal point moves 1 time or once to the left
2.500 or simply 2.5
on writing a percent as decimal..
we always have the divisor as 100.
number of zeros in 100 : 2
hence point moves 2 times or twice to the left.
25 / 100 = .25 or 0.25
on re-writing 0.25 as fraction, count the number of digits right to the point. it is 2 here.
hence there would be two zeros as well,i.e, 100
hence , 0.25 = 25/100
hope it helps you! :)