Doug wants to use mental math to add 413 and 351. Which of these shows how to break apart the numbers into hundreds, tens, and ones?
A.
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Break 413 into 400 + 13. Break 351 into 300 + 50 + 1.
B.
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Break 413 into 400 + 10 + 3. Break 351 into 300 + 51 + 1.
C.
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Break 413 into 400 + 10 + 3. Break 351 into 300 + 50 + 1.
D.
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Break 413 into 400 + 13. Break 351 into 300 + 51.

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

Which of the following circles have their centers in the third quadrant?