Each of 17 students will give a 1 1/2 minute speech in English class how long will it take to give the speeches

51/2, also known as 25 1/2

Step-by-step explanation:

Each = Multiply.

If there's 17 students, they all give 1 1/2 minute speech, then you multiply to get the minutes of how long it will take.

1. Convert 1 1/2 to improper.

2. Simplify 1 × 2 = 2.

3. Simplify 2 + 1 = 3

4. Add it in one equation. (Since 17 = 17/1, it equals to 17*3/2, shown below)

5. Simplify 17 × 3 = 51.

Mixed Number =

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15