F(x)= -3x+7; reflection in the x-axis

The reflection of the point (x,y) across the x-axis is the point (x,-y) → (x, -f(x)).

Therefore

f(x) = -3x + 7 → -f(x) = -(-3x + 7) = 3x - 7

45

step-by-step explanation:

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500