X+y=5 and x-3y=3 linear equation I don't get an answer that makes sense

If n is the average of three numbers x, 12, and 15, what is the value of x?

What is the best estimate of the product of 289 and 7

The hypotenuse of a right triangle is 5 feet. One leg of the triangle is 3 feet. What is the length of the other leg (rounded to the nearest hundredth) ?

A central angle of a circle is a right angle. What is its minor arc?

Select the mixed fractions that represents the shaded area of the figure.

The histogram below shows information about the hours students spent exercising in a week: A histogram is titled Weekly Exercise, the horizontal axis is labeled Hours of Exercise, and the vertical axis is labeled Students.

What is the rule for 24, 48, 72,

Eight more then the number Let n represent an unknown number

Yoku Is putting on sunscreen. He uses 2 ml to cover 50 cm² of his skin. He wants to know how many milliliters of sunscreen he needs to cover 325 cm² of the skin.

Find the measures of