How do you do quadratic regression?

First Press [STAT] to access the STAT menu.
2 Scroll right to highlight the CALC menu.
3 Press [5] to select QuadReg(ax+b).
• Press [2nd] [1] [,] [2nd] [2] to input L1,L2.
• Press [,] [VARS], scroll right to highlight Y-VARS, then press [1] [1] to input ,Y1.
• Press [ENTER] to calculate the quadratic regression. This will also copy the quadratic regression equation to the Y= Editor.

3 ft

step-by-step explanation:

since the triangle is right use pythagoras' identity to solve for a

the square on the hypotenuse is equal to the sum of the squares on the other two sides, that is

a² + 8² = ( )²

a² + 64 = 73 ( subtract 64 from both sides )

a² = 9 ( take the square root of both sides )

a = = 3

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)