What is 7a^{2} - a^{2} + 16

can u pls help answer my question 4d+15 is greater than or equal to -1

Step-by-step explanation:

6a^2 +16

Step-by-step explanation: Combining like terms (7 a^2 -a^2) you get 6a^2. That’s as much as it can be simplified without knowing the values of x because there are no more like terms. Hope this helps :)

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.