Is (5, 4) a solution to this system of equations?

2x + 3y = 23

y + x = 9

DEF is a right triangle

How do you find the distance of each number from the mean

Thomas is training for a race by running on a circular path. He knows that it is 0.75 mile from the tree in the center of the circular path to the path. How long is the path?

There are 8 rows in a theater with 12 seats in each row in the middle of the first three rows 4 seats are broken

What are the x intercepts of this function f (x) = 2x^2-7x-4?

Each decimals is a percent

The annual salary for a computer technician at Company A ranges from $41,000 to $63,000, with a mean of $58,000. At Company B, the annual salary for the same position ranges from $45,000 to $$65,000, with a mean of $56,000.

Marika and her three friends attend the school play. Tickets cost 5.75 each, and marika paid for everyone. Find the total cost of the tickets

A particular metal alloy a has 20% iron and another alloy b contains 60% iron. how many kilograms of each alloy should be combined to create 80 kg of a 52% iron alloy?

Imena's math test scores are 83, 93, 78, 89, and 83. She has one more math test this semester. What score most she get on the test to have a median score of 85?