math...please help asap
posted by anonymous .
Solve the following; use proper fractions in your answer:
1. 1/3 + 1/4 = 7/12
2. 4/52/3 = 2/15
3. 5/6 * 4/5 = 2/3
4. 3/7 divided by 6/8 = 4/7
5. 3 1/4  1 3/8 = 1 7/8.....is this a proper fraction?
6. 5 8/9 + 2 4/7 = 8 29/63..is this a proper fraction?
Reduce the following:
7. 15/9 = 5/3
8. 43/17 = 43/17
Conversions:
9. 13 centimeters =? meters
0.13 meters
10. 2.3 yards = ? inches
82.8 inches
11. 2 gallons = ? cups
32 cups
12. 15 years = ? seconds
473,040,000 seconds
13. 53 ounces = ? pounds
3.3125 pounds
Scientific Notation
Write the follow in proper scientific notation:
14. 3,141,592
3.141592 * 10 ^6
15. 437.234
4.37234 * 10^5
16. 0.004567
4.567 * 10^3
Write the number in nonscientific notation:
17. 6.02 * 10^4
60200
18. 9.8 * 10^2
.098
Solve the following in scientific notation:
19. 4.567 * 10^4 + 2.156 * 10^5
Answer: 2.61270*10^5 or would it be 10^4 since there is a zero on the end
20. (2.87*10^12)(1.56*10^3)
Answer: 4.4772*10^12???????? I'm not sure about the exponent on this one.
Percentages:
21. 25% of 36 is what numer? 9
22. 25 is what % of 125? 20%
Manipulating and Solving Equations:
Solve for the unknown in the following equation: d = 1/2gt^2
23. g = 2, t=4, d=?
d = 16
24. d=10, g=5, t=?
t=2
Solve the following eqeations for x:
25. 2x = 14
x=7
26. 3x+2y = 32
x= 2/3y+32/3
27. g=3yx^2
x = the square root of 9/3y
28. 12x/y = 3y
x= y^2/4
do u want to know if u are right?
7 increased by x
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