6. Hayes's dad is paying for a $50 meal. He has a coupon for 25% off for the meal. After the discount,
a 6% sales tax is applied. What does Hayes's dad pay
for the meal?

39.75

Step-by-step explanation:

This is because 25% of 50 is 12.5 and 12.5-50 is 37.5 and .06 x 37.5=2.25 if you add 2.25 to 37.5 you get the answer

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct