Answer:

Step-by-step explanation:
Let
be that number.





21 is the number.
Evaluate -(5)^2. Note that Order of Operations rules (PEMDAS) require that we perform exponentiation before multiplication.
Therefore, we evaluate 5^2 first, obtaining 25, and after that multiply this result by -1.
-(5)^2 = -25
Answer:
Step-by-step explanation:
Draw a picture. Seriously, this time you need to, so you can see that PS is the hypotenuse of a right triangle with legs of length 3 and 4 .
PS = √(3² + 4²) = 5
Perimeter = PQ + QR + RS + PS = 9 + 4 + 6 + 5 = 24 cm
D) y=14-5x
Hope this helps!