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3 years ago

What is the answer to 1 3/5 + 6 7/8

Mathematics

2 answers:

irina [24]3 years ago

7 0

8 19/40 as mixed number
339/40 as improper

Mashcka [7]3 years ago

6 0

You have to have a common denominator in order to be able to add the fractions so you have to multiply (3/5) by 8 to the top and bottom number. And multiply 5 to (7/8) to the top and bottom number. Now that you have common denominator you can add, adding your whole numbers gets you 7, and adding your fractions gets you 59/40. You can simplify, you can get another whole number from the added fraction which gets you 8 and your remaining fraction is 19/40. Your final answer is 8 19/40 which can not be reduced anymore.

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3 years ago

Read 2 more answers

4mm as a percentage of 9cm

hammer [34]

Answer:

4.4444 percent.

Step-by-step explanation:

1cm = 10mm

So 9cm would equal out to 90mm ...

4 mm would be 4.44 percent of the 9cm.

is (4) % (?)

of (90) 100

Cross X mutiply and divide..

4x100 = 400

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7 0

3 years ago

Abc daycare wants to build a fence to enclose a rectangular playground. the area of the playground is 910 square feet. the fence

Tatiana [17]

Given that the area of the playground is 910 square feet, let the length of the playground be x, then the width of the playground is given by $\frac{910}{x}$

Given that the fence along three of the sides costs $5 per foot and the fence along the fourth side, which will be made of brick, costs $15 per foot. Let the side with the brick fence be the side which measures x feet.

Then the cost for fencing the entire playground is given by

$C=5\left( \frac{910}{x} \right)+5x+5\left( \frac{910}{x} \right)+15x= \frac{9100}{x} +20x$

For, minimum cost,

$\frac{dC}{dx} =0 \\ \\ \Rightarrow- \frac{9100}{x^2} +20=0 \\ \\ \Rightarrow20x^2-9100=0 \\ \\ \Rightarrow x^2-455=0 \\ \\ \Rightarrow x=\pm\sqrt{455}$

But x can't be negative.

Therefore, the length of the brick fence that will minimize the cost of enclosing the playground is 21.33 feet.

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4 years ago