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2 years ago

It took Emma 3/4 hour to rake the leaves. It took her 1/5 hour more to

Mathematics

1 answer:

Angelina_Jolie [31]2 years ago

6 0

9514 1404 393

Answer:

total: 2.85 hours = 2 17/20 hours

Step-by-step explanation:

Strategy: convert all fractions to decimals, determine weeding and mowing times, and add the three times to find the total.

3/4 = 0.75

1/5 = 0.2

Solution:

raking time: 0.75 hours

weeding time: 0.75 +0.2 = 0.95 hours

mowing time: 0.95 +0.2 = 1.15 hours

Total time: 0.75 +0.95 +1.15 = 2.85 hours = 2 17/20 hours

_____

Additional comment

You may recognize that 0.95 is the middle of three equally-spaced values. Then the total will be 3×0.95 = 2.85 hours.

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2 years ago

A cube has a surface area of 486 cm2. What is the side length ?

astraxan [27]

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so.. notice the picture added here
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well, if the sides are equal, let's say the side is "x" long, then
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well, you have 6 of those squares, thus $\bf \textit{surface area of a cube}=
\begin{cases}
(x\cdot x)+\\
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3 years ago