Question

10 medals- need help @hartnn

Answer 1

lets do 18th first, its easier

Surface Area of Sphere
\(\Large = 4\pi r^2\)

here, r = 60 is given,
just plug in!

Answer 2

keep \(\pi\) as \(\pi\) only

Answer 3

for the 17th , use these formula
\(\Large V_{prism} = l wh\)
\(\Large V_{pyramid} =\dfrac{ lwH}{3}\)

l = 24, w = 3, h = height of prism = 12
H = height of pyramid = 21

then add the 2 volumes

Answer 4

@stastaoh sorry i already did 18 juat didnt notice I put it

Answer 5

ok, so use the formulas i gave you, for 17th

Answer 6

yeah I drew that in my notebook so do i calculate the volume of the rectangular prism first?

Answer 7

yes

Answer 8

you can calculate any volume first, prism volume is easier

Answer 9

864

Answer 10

what do I do next?

Answer 11

calculate volume of pyramid
V = lwH/3

l =24
w=3
H=21

Answer 12

504

Answer 13

good, the volume of composite figure would be the sum of these 2 volumes

Answer 14

864+504=...

Answer 15

1368

Answer 16

\(\huge \color{red}{\checkmark \quad \ddot \smile}\)

Answer 17

can you help me with a few more?

Answer 18

i can try :)

Answer 19

aright thnx ill post them in a sec

Answer 20

22 :
just check the ratio of sides

is 4/24 = 3/18=16/96

if all those 3 ratios are equal, then 2 figures are similar

Answer 21

they arent

Answer 22

?

Answer 23

they are

4/24 = 1/6

3/18 = 1/6

16/96 = 1/6

Answer 24

oh sorry

Answer 25

my first choice was 1:6 so is that correct?

Answer 26

yes!
"ys, 1:6" is correct :)

for 24, scale factor is ratio of sides
which is cube root of ratio of volumes

\(\Large S = \sqrt[3]{\dfrac{1331}{85184}}=...\)
use calculator.

Answer 27

ok 11/44

Answer 28

which is 1/4 :)

Answer 29

correct?

Answer 30

correct!

Answer 31

kk well thnx again for explaining them to me I really appreciate your help :)

Answer 32

welcome ^_^
happy to help :)