Question

A triangle has sides of length 10, 8, and y inches. Which is an expression for the perimeter of the triangle and what is the perimeter when y=7? A) 8(10+y) The perimeter is 136 inches when y=7. B) 10(y+8) The perimeter is 150 inches when y=7. C) y(10+8) The perimeter is 126 inches when y=7. (or) D) y+10+8 The perimeter is 25 inches when y=7.

Answer 1

the perimeter is the sum of them all so the answer is d) 7 + 10 + 8 = 25

Answer 2

Option (D) is correct.

Explanation:

Given: A triangle has sides of length 10, 8, and y inches.

To find: i) Expression for the perimeter

ii) The perimeter when
`y=7`

Solution: We know that the triangle has three sides, and the perimeter of a triangle is calculated by adding all the three sides.

Here, the three sides are 10, 8, and y inches.

Now, to find the expression for finding the perimeter we need to add the three sides.

So, the expression for perimeter is
`y+10+8`

Now, if
`y=7` , the perimeter is
`7+10+8=25` inches.

Hence, we get the expression for perimeter as
`y+10+8` and the perimeter when
`y=7` is 25 inches.

So, option (D) is correct.