4. A.
5. C.
6. D.
7. D.
Step-by-step explanation:
4. 3²+x²=5²
9+ x²=25
x²=25-9
√x²=√16
x=4
5. 8² + x²=10²
64+x²=100
x²=100-64
√x²=√36
x=6
6. 5²+12²=x²
25+144=x²
√169=√x²
13=x or x=13
7. 9²+40²=x²
81+1600=x²
√1681=√x²
41=x
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Answers & Comments
4. A.
5. C.
6. D.
7. D.
Step-by-step explanation:
4. 3²+x²=5²
9+ x²=25
x²=25-9
√x²=√16
x=4
5. 8² + x²=10²
64+x²=100
x²=100-64
√x²=√36
x=6
6. 5²+12²=x²
25+144=x²
√169=√x²
13=x or x=13
7. 9²+40²=x²
81+1600=x²
√1681=√x²
41=x