Each hour, the temperature dropped by 3 1/2 degrees. what was the change in temperature in 2 1/2 hours?

Multiply the change per hour by the number of hours:

3.5 degrees per hour x 2.5 hours = 8.75

Since the temperature dropped, the change would be a negative value.

The change was -8.75 ( -8 3/4) degrees.

8 3/4 degrees

Step-by-step explanation:

In 1 hour, the temperature drops 3 1/2 degrees.

In 2 1/2 hours, the temperature drops 2 1/2 times 3 1/2 degrees.

We need to multiply 2 1/2 by 3 1/2.

2 1/2 * 3 1/2 =

Change both mixed numerals into fractions.

= (2 + 1/2) * (3 + 1/2)

= (4/2 + 1/2) * (6/2 + 1/2)

= 5/2 * 7/2

= 35/4

= 8 3/4

The temperature change in 2 1/2 hours was 8 3/4 degrees.

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.

24

step-by-step explanation:

the graph shows 30% of students walk. 80 students were questioned, so the number that said they walk is

30% × 80 = 0.30 × 80 = 24