Answer:
Below
Step-by-step explanation:
To convert calories to joules, you need to multiply the value by 4184
450 x 4184 = 1882800 J
If your teacher requires you to round to significant figures, you would round to 2 sig figs as 450 only has 2 sig figs
450 x 4184 = 1.9 x 10^6
Hope this helps! Best of luck <3