What is the perimeter of a triangle with side lengths of 9, 12, and 4x?

1. 25

2. 25 + x

3. 21x

or

4. 21 + 4x

On a given planet, the weight of an object varies directly with the mass of the object. Suppose that an object whose mass is 9 kg weighs 45 N. Calculate the mass of another object that weighs 30 N.

A car traveling at a certain speed will travel 76 feet per second. How many miles will the car travel in 3.1 hours if it maintains the same speed? Round to the nearest tenth.

Find the vertices and foci of the hyperbola with equation x squared over nine minus y squared over sixteen = 1.

What is the area of a triangle with the numbers are 5,16,14

If a boy and a half can eat a hot dog and a half, in a minute and a half, how many hot dogs can six boys eat in six minutes?

What contain variable, numbers, nd at least 1 operation

The data set is 7,8,10,11. How would the mean, median, and mode change if you added a 9 to the data set?

What is 81/3 minus 65/6

What is 8 1/2 divided by 5 2/3

One woman is able to buy 5 hat and 4 pairs of mittens for $30 another woman purchase 5 pairs ovens and 2 hats for 19 what are the prices