What is the value of the underline digit 28

The hours since a person has eaten and the strength of hunger they feel. what is the independent and dependent variable?

Roger is buying a new pair of shoes for 25% off. if the original price of the shoes was $90.00, how much money is roger saving on the shoes?

What is 4 + (-2) equal?

Use the definition of O (f) to show that 4^n + 25 is O (5^n) (ii) show that 5^n is not O (4^n)

A female student weighs 120 pounds and plans to go home in two hours. Calculate her BAC if she has 3 glasses of wine. Round to the nearest hundredth of a percent.

A scientist is measuring the temperature change and a chemical compound the temperature dropped 11 Fahrenheit per hour from the original temperature after four hours the temperature was 90°F find the compounds original temperature

Concrete can be purchased by the cubic yard. How much will it cost to pour a slab that is 17 ft by 17 ft by 2 ft if the concrete costs $40.00 per cubic yard?

A county government says that a safe level of chlorine in a hot tub is within 1.75 ppm of 3.25 ppm.

I have no idea about this! You need to simplify this:

2x+4y+2z = - 8 5y-2z = 0 4z = - 20