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3 years ago

14

I need help solving this

1 answer:

inessss [21]3 years ago

5 0

Answer:

Base = 18

Height = 9

x = 7

Step-by-step explanation:

$A = \frac{1}{2}\cdot b.h \\\\\ \frac{(x + 2)(2x + 4)}{2} = 81 \\\ \frac{2x^2 + 4x + 4x + 8}{2} = 81 \\\\\ 2x^2 + 8x + 8 = 162 \\\ 2x^2 + 8x - 154 = 0 \\\ \Delta = (8)^2 - 4.2.(- 154) \\\ \Delta = 1296 \\\ x = \frac{- 8 + 36}{4} \\\\\ x = \frac{28}{4} \\\\\ x = 7$

Base = 2 × 7 + 4 = 18

Height = 7 + 2 = 9

I hope I helped you.

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Write the x-intercept of the graph of -6x + y = 8.

Trava [24]

Answer:

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Step-by-step explanation:

x-intercept when y = 0

-6x + 0 = 8

so

-6x = 8

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6 0

3 years ago

Ling worked three more hours on Tuesday than she did on Monday. On Wednesday, she worked one hour more than twice the number of

Nina [5.8K]

Let x be the number of hours ling work on monday.

We know that she worked three more hours on tuesday that in monday, this can be express as :

$x+3$

We also know that in wednesday she worked on more hour than twice the number on mondays, this can be expressed as:

$2x+1$

The total number of hours she worked this three days in two more than five the number of hours she worked on monday, this can be express as :

$5x+2\\$

Now , once we have all the expressions we add the expressions of the days and equate them to the total

$x+(x+3)+(2x+1)=5x+2$

Now we solve the equation

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7 0

3 years ago

Read 2 more answers

Value of the y-intercept of the graph of f(x) = e1–x – 1?

frozen [14]

Answer:

(0, e-1) or (0, 1.718) to the nearest thousandth.

Step-by-step explanation:

The y-intercept occurs when x = 0 so here we have:

y = e^(1 - 0) - 1

= e - 1

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3 years ago

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SashulF [63]

Answer:

Step-by-step explanation:

First substitue the coordinates to the equation so

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multiply the two numbers above

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subtract the whole number from both sides

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in equation would be

y= -3/7 + 5/6/7

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3 years ago

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photoshop1234 [79]

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