Use special right triangles to solve for y.

Step-by-step explanation:

Notice that the problem is about a right triangle, where the opposite leg is 7 and the acute angle is 45°.

This is an special right triangle because it has acute angles of 45°, that means the legs are congruent, because it's a symmetric right triangle. Basically, when a right triangle has acute angles of 45°, it means is an isosceles triangle too.

Additionally, a special right triangle like this has a pattern, its hypothenuse is , where is the length of a leg.

So, in this case, the hypothenuse is

And the missing leg is .

answer: 1, 3 and 5 are correct

step-by-step explanation:

y=3n + 1

step-by-step explanation:

this is wrong because it says the second number is one less and i added one instead