Geometry? Answer what you can

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Geometry? Answer what you can

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http://prntscr.com/7a9ecl 1 http://prntscr.com/7a9eey 2 http://prntscr.com/7a9ehd 3 17.A rectangular pyramid fits exactly on top of a rectangular prism. The prism has a length of 18 cm, a width of 6 cm, and a height of 9 cm. The pyramid has a height of 15 cm. Find the volume of the composite space figure. (1 point) 504 cm3 1,512 cm3 1,620 cm3 2,592 cm3 18.radius of 70 m (1 point) 4,900 pi m2 19,600 pi m2 9,800 pi m2 14,700 pi m2 19. A spherical balloon has a circumference of 21 cm. What is the approximate surface area of the balloon to the nearest square centimeter? (1 point) 1,385 cm2 561 cm2 346 cm2 140 cm2 21.What is the volume of the sphere? Round the answer to the nearest cubic unit. R= 16 cm http://prntscr.com/7a9evd http://prntscr.com/7a9eza 24.What is the scale factor of a cube with volume 1,331 ft.3 to a cube with volume 85,184 ft.3? 121:1,936 1:64 4:1 1:4
Do I post my answers? I got 1:4 I just need clarification

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Other answers:

17 is 1,512 cm3
18 is 19,600 m2
Thank you!! :)
#19 sphere surface area =4*pi* r^2 circumference of 21 cir= 2* pi* r => r=21/(2*pi) area= 4*pi (21/(2*pi))^2= 4 *pi *21^2/pi^2/4=21^2/pi
# 21 volume = 4/3*pi* r^3= 4/3*pi *(16)^3=
17157.284679
# 22 18--> 3 24---->4 so 18/3=6 24/4=6
so 1:6 ?
yes
# 23 do as 22
Also I didn't get 21, can you clarify? by the way thank you so much I appreciate this a lot! I've been stuck on this for a few hours and it's been annoying. I suck at geometry
21 asking about the voulem and the radius is given the equation is =4/3 * pi * r^3
* Volume
thank you! and for 23 I got 1:2.4 Is that right?
you are right
# 24 ?
http://prntscr.com/7a9pib
WHEN U GUYS R DONE DO U MIND HELPING ME CHECK MY ANSWERS
it's 1 am for me and I'm trying to do my work, I'll try if simple.
IT IS grade seven work
# 24 85,184 /1331
Oh okay B, that makes sense
yes
I'm calculating 21 still and end up with B. Is that right? I ended up rounding.
i don't know what is B
nvm I got it, it was c. I see what I did wrong.
are these correct? http://prntscr.com/7a9sr5

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