Lets split the box in pieces and then add:
top = 20*15 = 300
sidesA = 2*20*9 = 360, is multiplied by 2 cause there are 2 sides like this
sidesB = 2*9*15 = 270, is multiplied by 2 cause there are 2 sides like this
so in total we have:
total = 300 + 360 + 270 = 930 cm^2
if we express this quantity in mm^2 we have:
<span>1cm² = 100 mm²</span>total = 930*100 = 93000 mm^2
so if the tiles are 5 mm^2 we need:
total tiles = <span>93000/5 = 18600
we need 18600 tiles of 5 mm^2</span>
Answer:
The answer is $19.44
Step-by-step explanation:
First, set up a proportion for tax and tip.
Your proportion should be x (the variable) over 28.80, equal to 25 over 100.
Then, cross multiply to set up an equation.
Your equation should be 100x is equal to 720.
Solve the equation by dividing both sides by 100, getting the amount for your variable, x, which should be $7.20.
Next, subtract $7.20 from the original price of 28.80, getting $21.60.
Next, set up the same proportion, except make it so that x is over $21.60 and 10 is over 100.
Cross multiply and set up your equation which is 100x is equal to 216.
Solve the equation by dividing both sides by 100, getting the value if x as $2.16.
Finally, subtract $2.16 from the sale price of $21.60, giving you your answer of $19.44.
For this case we have an expression of mixed numbers:
Rewriting the expression we have:
Remember that equal signs are added and the same sign is placed.
Answer:
Answer: 4,5
Step-by-step explanation: