Justin bought 40 packs of baseball cards for a discounted price of $64. if he sells 10 pack of baseball cards to a friend at cost, how much should he charge

$16

Step-by-step explanation:

If Justion bought 40 packs of baseball cards for $64 we can determine the price of per pack:

= $64/40 packs = $1.6 per pack of baseball cards

If Justin wants to sell the baseball card packs he would have to charge:

= $1.6*10 = $16

At cost price, he must sell 10 card packs for $16.

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:

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.