Answer:
1
Step-by-step explanation:
Use the Pythagorean therm , you know the a^2+b^2=c^2
Answer:
B
Step-by-step explanation:
In A, it says that 9s +7c can be lower or equal to 160. This is wrong.
In C, it says that 9s +7c can only be higher than 160, when the question says at least, which means it can also be equal to 160, making it wrong.
In D, it says that 9s +7c can be lower or equal to 20. This is wrong.
Through elimination, only B can be right.
11.k>-3(4r+3)/4r-5
12.k<(2x+2)/x+3
