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3 years ago

I need to know the steps to simplify 15.7 + (-3.45)

Mathematics

2 answers:

V125BC [204]3 years ago

7 0

The answer to 15.7+(-3.45) is12.25

faust18 [17]3 years ago

5 0

U call it keep change change. keep 15.7. change it to subtract and change -3.45 to just 3.45 (positive not negative)

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3 friends were at a Mexican Restaurant. They were feeling hungry, so they ordered 8 burritos to eat. They want to share the burr

Alla [95]

Answer:

8/3 or 2 and 2/3

Step-by-step explanation:

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3 years ago

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g The fencing of the left border costs $10 per foot, while the fencing of the lower border costs $2 per foot. (No fencing is req

klio [65]

Answer:

$Area = 1690ft^2\\x = 130ft, y = 26ft$

Step-by-step explanation:

Given the costs we can form an equation:

$10y + 2x =520 - Eq(A)$

and fencing is triangular such that the area enclosed can be written as:

$A = \dfrac{xy}{2} -Eq(B)$

First need to convert the above equation so that it is only in terms of one variable. [either x or y]

To make the equation only in terms of $x$ we can substitute $y$ from Eq(A) i.e, $y =\frac{520-2x}{10}$ , to Eq(B)

$A = \dfrac{x}{2} \dfrac{520-2x}{10}$

simplify

$A = \dfrac{520x - 2x^2}{20}$

$A = -\dfrac{1}{10}x^2 + 26x$

Now, in order to find the maximum area enclosed we can find $\frac{dA}{dx}$ and equate it zero.

$\dfrac{dA}{dx} = -\dfrac{1}{5}x + 26$

$0 = -\dfrac{1}{5}x + 26$

$-26 = -\dfrac{1}{5}x$

$x = 130$

we have the length of one dimension: specifically, the lower fence will be $x =130ft$

we can use this value of $x$ to find the corresponding value of $y$ . From Eq(A)

$10y + 2x =520$

$10y +2(130) = 520$

$y = \dfrac{520 - 2(130)}{10}$

$y = 26$

the length of the left fence will be $y =26ft$

The enclosed area by the fence will be

$A = \dfrac{xy}{2}$

$A = \dfrac{(130)(26)}{2}$

$A = 1690$

Hence the maximum area that can enclosed by the fences provided the costs will be $1690ft^2$

You can even check the cost of the dimensions whether they all add up to $520 or not.

Use Eq(A)

$10y + 2x =520$

$10(26) + 2(130) =520$

and indeed it does!

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3 years ago

I NEED HELP ASAP<br> "Find the measure of each angle in the following diagram"

weeeeeb [17]

Answer:

Each angle is 60°

Step-by-step explanation:

The 2 angles are equal to each other because they're alternate exterior angles:

10x - 20 = 7x + 4

10x - 7x = 4 + 20

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x = 8

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Since these angles are exterior angles, their angle measures are equal so they both are 60°

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3 years ago

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Romeo is chucking pebbles gently up to Juliet's window, and he wants the pebbles to hit the window with only a horizontal compon

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Answer:

4.45 m/s

Step-by-step explanation:

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3 years ago

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nasty-shy [4]

Answer:

Step-by-step explanation:

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Angle D = 180 - 117

Angle D = 63 degrees

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3 years ago

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