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sesenic [268]
3 years ago
15

13=s-21 —solving equations

Mathematics
1 answer:
rewona [7]3 years ago
7 0

Answer:

34 = s

Step-by-step explanation:

To solve for s, add 21 to both sides of the equation.

13 = s - 21

21 + 13 = s - 21 + 21

34 = s

<em><u>#teamtrees #PAW (Plant And Water)</u></em>

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Find the dimensions of a rectangle, length 7m less than three times the width and the area of the rectangle is 66m^2.
zhuklara [117]

  We know: length of a rectangle is 7m less than three times the width.

So let's set the length to l, width to w.

And we can get that l = 3w-7.

We also know that the area of the rectangle is 66 m^2.

Thus, l*w= 66.

So we have:

function 1: l=3w-7

function 2: l*w=66

plug function 1 to 2.

(3w-7)*w=66

3w^2-7w-66=0

w=6 and -11/3.

And the width of a rectangle can not be negative.

So: w=6.

Plug w=6 back to function 1 or 2, either way is correct and can give you the length. In this case, I will plug it back to function 1.

l=3*6-7=11.

So: the width of the rectangle is 6, and the length of the rectangle is 11.


5 0
4 years ago
Caitlyn spend $17 at the store. She buys a mop for five dollars and three bottles of floor cleaner. If X represents the cost of
Citrus2011 [14]

Answer:

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Step-by-step explanation:

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3 years ago
An object is thrown straight up from the top of a 100-foot platform at a velocity of 48 feet per second. The height h(t) of the
julsineya [31]

Answer:

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  • The time it takes to achieve this height is 1.5 s.

Explanation:

<u>1. Function for the height (given):</u>

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<u />

<u>2. Type of function</u>

That is a quadatic function, whose graph is a parabola that opens downward.

The maximum of the function, i.e. the maximum height, is the vertex of the parabola.

The vertex of a parabola with the genral equation   y=ax^2+bx+c  is at the x-coordinate

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<u>3. Time to achieve the maximum height</u>

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<u />

<u>4. Maximum height:</u>

Replace t with 1.5 in the equation, to find the maximum height, h(1.5)

     h(1.5)=-16(1.5)^2+48(1.5)+100=136

Then, the maximum height is 136 ft

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