Answer:
C
Step-by-step explanation:
To add the polynomials you can only add like terms. Like terms are terms that have the same variables and exponents. Only -5 and 4 are like terms. So leave the other terms alone.
The sum is 11x^2 + x - 1.
Can you post the question?
3x + 5y = 10 Subtract 3x from both sides.
5y = -3x + 10 Divide both sides by 5.
y = -3/5x + 2
Step-by-step explanation:
The sum of a twice number, x, and twice another number, y, is -78.
You could either use a calculator on the internet or do it manually:
512
128 * 4
32 * 4 * 4
8 * 4 * 4 * 2 * 2
8 * 8 * 4 * 2
8 * 8 * 8 = 512