Select all the relationships that demonstrate a positive association between variables.

1)Outside temperature and cost to heat a home

2)Number of people in a grocery check-out line and how long you have to wait to check out

3)Length of time you have walked and distance you have traveled

4)Pounds of cherries you buy and amount of money you spend on cherries

5)Speed of a train and the amount of time it takes for the train to get to its destination

arrange the equations with like terms in columns.

analyze the coefficients of x or y.

add the equations and solve for the remaining variable.

substitute the value into either equation and solve.

check the solution.

step-by-step explanation:

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1

you can't solve x because it is 2 linear equation and you only have one equation

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a