Answer:
a=3
Step-by-step explanation:
24= -3(2a-15)-a -->given
24=-6a+45-a -->distribute the -3
24=-7a+45 -->combine like terms
-21=-7a -->subtract 45 from both sides
3=a -->divide both sides by -7
The perimeter of the rectangle is 64
Answer:
answer is in the picture with work, just know your formulas and plug the numbers in and you'll be fine
A standard piano has 88 keys on it
First we write it into scientific notation which is 3.5*10^7. now it's order of magnitude is power of 10 that is 7. So order is 7.