1. use elimination or substitution method to solve each equation. show your steps. y = 2x-3 x+y=15

Free 100 points to whoever says “oof the porridges” if it’s not exact, your answer will be reported, first person gets brainliest

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?