Write an inequality and use substitution to solve the following problem: chris has 45 dollars saved up. he currently makes 5 dollars each day walking dogs. chris wants to purchase a new stereo for 72 dollars. which of the following numbers of days worked will allow chris to purchase the stereo?

5.4 days (6 days)

Step-by-step explanation:

First set up an equation. (x represents days)

5 dollars a day = 5x ; Already has 45 = +45 ; Needs 72 = =72

That means your equation is...

5x + 45 = 72

Now solve for x.

5x = 27          Subtract 45 from both sides.

x = 5.4          Divide both sides by 5.

This means he will have to work for at least 6 days.

I hope this helped. :)   (I love these kinds of problems!)

i did it myself and i got 4.2 (b) hope its right

step-by-step explanation:

d. $180

step-by-step explanation:

if the dimensions of the room is 9ft by 12 ft, we have the area of the floor as,

so the area of the floor is 108 square feet, converting that into square yards we get,

the cost of carpet is $15 per square yard, therefore the cost of carpet for 12 square yards is,

hence, the cost of carpet is $180.

assuming the dimensions of the room be,

15 ft by 12 ft

so, the area of the floor of that room is,

we can convert 180 square feet into square yards, we know that,

1 sq ft = 0.111 sq yard

so, 180 square feet is,

so the area of floor is 20 square yards.

now, the cost of carpet is 15 dollars per square yard, therefore the cost of carpet for 20 square yards is,

so, it will cost $300.