MATH HELP ME !!!! PRE ALGEBRA !!!
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MATH HELP ME !!!! PRE ALGEBRA !!!

[From: ] [author: ] [Date: 11-05-14] [Hit: ]
?Write a proportion then solve.a.18 miles in .34 hours; 54 miles in x hours.b.......
Simplify.
(-3a2b)3

Find the LCM of the following.
4x2 and 14xb
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correct me on this one and how do you write a proportion???

Write a proportion then solve.

a. 18 miles in .34 hours; 54 miles in x hours.


b. How many minutes does x equal?

( my answer)

a.?????I DONT KNOW HOW TO WRITE A PROPORTION???))
102 hours

b. 6120 minutes

-
Are these exponents? You need to write a caret (^) symbol for exponentiation. For instance, "5 squared" is written 5^2.

I'm going to assume you meant to write exponents:

#1.
(-3 * a^2 * b)^3
= (-3)^3 * (a^2)^3 * (b)^3
= -27 * a^6 * b^3

#2a.
A proportion is simply a fraction. That's all.
(18 miles) / (0.34 hours)
(54 miles) / (x hours)

#2b.
Set the fractions equal:
18 / 0.34 = 54 / x
⇔ x * 18 / 0.34 = 54
⇔ x * 18 = 54 * 0.34
⇔ x = 54 * 0.34 / 18 = 1.02 hours
x = (1.02 hours) * (60 minutes / 1 hour) = 61.2 minutes
1
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