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nasty-shy [4]
3 years ago
8

Gymnast are lined up at the drinking fountain. The first four each take 10 3/10 seconds. The fifth takes 5 4/5 seconds. The sixt

h and seventh each take 12 2/5 seconds. Mariah, who is eighth, calculates that she has waited 1 minute, 11 4/5 seconds for her turn. Is she right?
Mathematics
1 answer:
katen-ka-za [31]3 years ago
5 0
Yes, Mariah is correct!
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-x+1=0<br><br>please let me know<br>sovle for x
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6 0
3 years ago
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I need to find the surface area for this one pls help me
Alex

Step-by-step explanation:

so, you got the volume but don't know how to find the surface area ? that is strange for me. what's the problem ?

the surface of a cube or rectangular prism consists of 6 sides that split (for a rectangular prism) into 3 pairs of equal sides :

top and bottom

left and right

front and back

all we need to do is calculate the areas of these 6 rectangles and add them up. that's it.

in our case

top and bottom : 5×4 × 2 = 20×2 = 40 in²

left and right : 4×4 × 2 = 16×2 = 32 in²

front and back : 5×4 × 2 = 40 in²

so, in total, the whole surface area of the prism is

40 + 32 + 40 = 112 in²

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1 year ago
Wegnerkolmp or someone who can explain maths please<br> I need a proper explanation
umka2103 [35]

Answer: 66 degrees

Explanation:

Check out the attached image below. Figure 1 is the original image without any additions or alterations. Then in figure 2, I extend segment BC to form a line going infinitely in both directions. This line crosses segment DE at point F as shown in the second figure.

Note how angles ABC and DFC are alternate interior angles. Because AB is parallel to DE (given by the arrow markers) this means angle DFC is also 24 degrees

Focus on triangle DFC. This is a right triangle. The 90 degree angle is at C.

So we know that the acute angles x and 24 are complementary. They add to 90. Solve for x

x+24 = 90

x+24-24 = 90-24

x = 66

That is why angle CDE is 66 degrees

6 0
3 years ago
Olivia and her children went into a grocery store where they sell peaches for $2 each and mangos for $1 each. Olivia has $15 to
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Answer:

if x represents the number of peaches purchased and y represents the number of mangos purchased

Step-by-step explanation:

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2 years ago
The half-life of helium-5 is 7.6 × 10-22 seconds, and the half-life of helium-9 is 7 × 10-21 seconds. Approximately how many tim
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(7 × 10-21) / (<span> 7.6 × 10-22) = 9.21 times greater</span>
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3 years ago
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