Answer:

Step-by-step explanation:
add/subtract the terms with same power of variable

20.5 is the IQR of the given set of numbers.
The length of the side QR in the task content can be determined as; 12.22cm.
<h3>What is the length of the third side QR?</h3>
It follows from the task content that 2 lengths and one included angle are given in the task content. It therefore follows that the length of side QR can be evaluated by the cosine rule as follows;
QR² = 13² + 4² - (2×4×13×cos70)
QR = √149.4
QR = 12.22cm
Read more on cosine rule;
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Step-by-step explanation:
Try to simplify 45/75 as much as you can, or just use a calculator. Then, multiply your result by 100% to get the answer.