Use this chart to help solve the problem. Tonya's age (yr.)

Tonya's height (in.)

3

36.8

4

40

5

41.25

6

45

7

48.0

8

51.5

Tonya grew 2.25 more inches before her 9 year height was recorded. What is her height at age 9

written with the correct number of significant digits?

Tanya's height at age of 9 is 53.75 inches

Step-by-step explanation:

Tonya's age (yr.)     Tonya's height (in.)

3                                        36.8

4                                         40

5                                       41.25

6                                        45

7                                        48.0

8                                       51.5

Tanya's height at the age of 8 = 51.5

We are given that Tonya grew 2.25 more inches before her 9 year height was recorded.

So, Tanya's height at age of 9 = 51.5+2.25

Tanya's height at age of 9 =53.75 inches

Hence Tanya's height at age of 9 is 53.75 inches

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.