A triangular prism is shown below.
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To solve this you first need to turn your mixed numbers into improper fractions. to do this for you multiply the denominator (5) by the whole number (9) to get 45 and then add that to the numerator (4) to get your new fraction
.
You repeat this process with to get
.
Now that you have two fractions you can multiply by the opposite reciprocal. To do this you flip the second fraction and change the division sign to a multiplication sign like so
Then, you just multiply the fractions by multiplying the numerators to get 98 and multiplying the denominators to get 35.
Now, to simplify you first divide both the numerator and denominator by 7 to get
.
Finally, you can take 10 out of the numerator to make