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DIA [1.3K]
4 years ago
7

Is this right??? Idk what to do on this question and neither does my mom!

Mathematics
2 answers:
Fed [463]4 years ago
4 0
They are telling you to make inches into feet
I foot equals 12 inches
84 divided by 12 equals 7
Answer is seven
yanalaym [24]4 years ago
3 0
You need to divide 84 by 12.

another way 82/x = 12/1  then cross multiply 12x = 82
final answer: 6.83333-
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52 POINTS. <br> ⦁ Solve for x
pentagon [3]

Answer:

  • x = - 2.5

Step-by-step explanation:

  • 3^{4x - 5}=(1/27)^{2x + 10}
  • 3^{4x - 5}=(1/3^3)^{2x + 10}
  • 3^{4x - 5}=(3^{-3})^{2x + 10}
  • 3^{4x - 5}=3^{-3*(2x + 10)}
  • 4x - 5 = - 3*(2x + 10)
  • 4x - 5 = - 6x - 30
  • 4x + 6x = 5 - 30
  • 10x = - 25
  • x = - 2.5

4 0
3 years ago
Derivatives concept:<br> Exercises using the definition of derivatives:<br><br> (Full development)
krok68 [10]

(A) <em>f(x)</em> = 7 is constant, so <em>f(x</em> + <em>h)</em> = 7, too, which makes <em>f(x</em> + <em>h)</em> - <em>f(x)</em> = 0. So <em>f'(x)</em> = 0.

(B) <em>f(x)</em> = 5<em>x</em> + 1   ==>   <em>f(x</em> + <em>h)</em> = 5 (<em>x</em> + <em>h</em>) + 1 = 5<em>x</em> + 5<em>h</em> + 1

==>   <em>f(x</em> + <em>h)</em> - <em>f(x)</em> = 5<em>h</em>

Then

\displaystyle f'(x) = \lim_{h\to0}\frac{5h}h = \lim_{h\to0}5 = 5

(C) <em>f(x)</em> = <em>x</em> ² + 3   ==>   <em>f(x</em> + <em>h)</em> = (<em>x</em> + <em>h</em>)² + 3 = <em>x</em> ² + 2<em>xh</em> + <em>h</em> ² + 3

==>   <em>f(x</em> + <em>h)</em> - <em>f(x)</em> = 2<em>xh</em> + <em>h</em> ²

\implies\displaystyle f'(x) = \lim_{h\to0}\frac{2xh+h^2}h = \lim_{h\to0}(2x+h) = 2x

(D) <em>f(x)</em> = <em>x</em> ² +<em> </em>4<em>x</em> - 1   ==>   <em>f(x</em> + <em>h)</em> = (<em>x</em> + <em>h</em>)² + 4 (<em>x</em> + <em>h</em>) - 1 = <em>x</em> ² + 2<em>xh</em> + <em>h</em> ² + 4<em>x</em> + 4<em>h</em> - 1

==>   <em>f(x</em> + <em>h)</em> - <em>f(x)</em> = 2<em>xh</em> + <em>h</em> ² + 4<em>h</em>

\implies \displaystyle f'(x) = \lim_{h\to0}\frac{2xh+h^2+4h}h = \lim_{h\to0}(2x+h+4) = 2x+4

5 0
3 years ago
Prove that |a| &lt; b if and only if -b &lt; a &lt; b
asambeis [7]

Answer:

Since,

|x|=\left\{\begin{matrix}x &\text{ if } x \geq 0 \\ -x &\text{ if } x < 0\end{matrix}\right.

Here, the given equation is,

|a| < b

Case 1 : if a ≥ 0,

|a| < b ⇒ a < b

Case 2 : If a < 0,

|a| < b ⇒ -a < b ⇒ a > - b

( Since, when we multiply both sides of inequality by negative number then the sign of inequality is reversed. )

|a| < b ⇒ a < b or a > - b ⇒ -b < a < b

Conversely,

If -b < a < b

⇒ a < b or a > - b

⇒ a < b or -a <  b

⇒ |a| < b

Hence, proved..

7 0
4 years ago
What is 760 times 43
Naddik [55]

760 times 43 is 32680

8 0
4 years ago
Read 2 more answers
pls solve this question for brainiest the( find the perimeter of a rectangle its length 2cm and its diagonal is 2.5cm
zubka84 [21]

Answer:

find the wat.....u didnt specify..please

4 0
3 years ago
Read 2 more answers
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