How much would a set of seven rocks cost if I paid $350 for 28 rocks

$87.50

Step-by-step explanation:

We can find the price by dividing 350 by 4, since 28 divided by 4 is 7.

350/4

= 87.5

So, a set of seven rocks would be $87.50

87.50

Step-by-step explanation:

We can use ratios to solve

28 rocks           7 rocks

  =

350 dollars        x dollars

Using cross products

28x = 350*7

Divide each side by 38

x = 350*7/28

x =87.5

step-by-step explanation:

x > 1.3

step by step:

8.5−0.9x> 9.8−1.9x

step 1: simplify both sides of the inequality.

−0.9x+8.5> −1.9x+9.8

step 2: add 1.9x to both sides.

−0.9x+8.5+1.9x> −1.9x+9.8+1.9x

1x+8.5> 9.8

step 3: subtract 8.5 from both sides.

1x+8.5−8.5> 9.8−8.5

1x> 1.3

step 4: divide both sides by 1.

1x/1 > 1.3/1