About how many grams did the box weigh

Your answer for 17 is C 1544 grams ...

3.4 x 454 = 1543.6 which rounds to 1544

Since we are looking for the estimate of the boxes weight in grams, we can round down 3.4 to 3

We know that 1 pound is 454 grams so all we have to do is multiply 454 by 3

454 x 3 = 1,362

Based on the options, C. 1,544 would be the best option. Especially because we rounded down so the actual answer would be higher than 1,362

Hope this helps you

Brainliest would be appreciated

-AaronWiseIsBae

You can use the C. HL Theorem to prove the triangles congruent.

To use the HL THeorem to prove the triangles congruent, you have to check for three conditions. 
1) The triangles are both right triangles.
2) Their hypotenuses are congruent
3) They have one pair of congruent legs.

The squares at the angle of the triangle indicate the triangles are right triangles. Since the triangles in the picture share one side, the hypotenuse, the hypotenuses of the triangles are congruent. The triangles also have one pair of congruent legs. Since all three conditions of the HL Theorem are met, the triangles are congruent.