Divide the $150 by $30 to find out how many lawns Miguel has to mow to make the same as his weekly salary.
150 divided by 30 = 5
If he mows five lawns he makes exactly the same as his weekly salary.
The question is, when does he start making more money than $150 from the number of lawns...

It has to do with the combination of numbers. You can only start with one of the following numbers: 3, 4, 5, or 6, because the numbers form one through twelve only have either 3, 4, 5, or six letters. It happens so that if you start with three, you go five and five steps and land on one.
If...

The triangle is possible. It would not be possible if for example one side is longer than the sum of the other two sides, because it would not be able to reach.
This is an obtuse triangle (one angle larger thaqn 90 degrees) and also a scalene triangle (all sides and all angles are different)...

I'm sure your test was a while ago, but the difference between isotopes of the same element is in the number of neutrons.

If you use "geo" as a prefix for earth, then the alternative would be "or," the article "an" and the beginning of earth "ge," making the word orange.

First you find the molar mass of each atom in your periodic table:
Beryllium has 9.01 g/mol and Chlorine has 34.45 g/mol.
Since the molecule is BeCl2, you have to add the molar masses of 1 BE + 2 Cl, which makes 9.01g/mol + 2(34.45g/mol) = 77.91g/mol.
Since you have 2.5 mol of...

Find the speed of the boat by dividing 60 km by 8 hours, which is 7.5 km/hr. Since during all this time the river was working against the boat with a speed of 4 km/hr. You add that together to make 11.5 km/hr, that is the speed the boat would have to be able to go in still water.

Dori bikes 11 times as much as Kevin, or they ahve a ratio of 11:1. Add 11+1 =12, divide 156 by 12 which gives you 13. Kevin biked 13 miles and Dori bikes 11 times 13 miles, which is 143 miles.

You have to find out how many minutes are in a year:
3 oz X 60 minutes (to get to an hour) X 24 (to get to day) x 365 (to get to a year) = 1,757,800 oz or (divide by 128) 12,318.75 gallons in a year.

Divide the perimeter by two to get exactly one length and one width (because a perimeter has two of each), which is 220.
Since the ratio is 7:4, you add 7+4 which equals 11.
Divide 220 by 11, which gives you 20.
The length is 20 times 7 (=140) and the width is 20 times 4 (= 80).
Check...

Add the radius, the wall thickness, and the thickness of the insulation:
10.6 cm + 2.575 cm + 4.4 cm = 17.575 cm
The diameter is twice the radius, therefore double the number:
2 x 17.575 = 35.15 cm
Now round it because you can only have one...

What the trains have in common is the time it takes them to meet, which is for both the same time.
When train B leaves, train A is already gone for 8 hours and has covered a distance of 8h x 80km/h, which is 640 km.
After that it takes them the same amount of time (t) to meet...

Do you have a specific question about a math problem?
Remember, on the other end of the computer is a teacher. :-)

You can set up the problem with the following equation (x means "times"):
85 x ($12 - $5) - $230 = ?
You multiply your profit for each pizza, which is $12 cost of pizza minus $5 to make it, with 85 times, the number of pizzas you make. You subtract form all this the fixed...

This problem is about circular motion. The formulas for circular motion are as follows:
F(c) = m x a(c) and a(c) = v(square) / r therefore F(c) = m x v(squre) / r
Centripetal force = F(c), centripetal acceleration = a(c), m=mass, v=velocity, r=radius
You...