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ELEN [110]
3 years ago
14

I need help solving this

Mathematics
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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Please help asap! And no links or weird answers, please :(
Sauron [17]

Answer:

yes,  because at every x is associated one and  only one y

Step-by-step explanation:

4 0
2 years ago
Complete the following tasks for this equation: b/7.8= -2.15.
riadik2000 [5.3K]

Answer:

Step-by-step explanation:

Factors

  • A term in multiplication for an entire variety by which a bigger complete quantity may be divided
  • A divisor is an integer that evenly divides a range without leaving the rest
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  • Integer factorization, the manner of breaking down a composite quantity into smaller non-trivial divisors
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(b)/(7.8)=-2.15

Multiply each term in the equation by 7.8.

(b)/(7.8)*7.8=-2.15*7.8

Cancel the common factor of (1)/(7.8).

1b=-2.15*7.8

Multiply -2.15 by 7.8 to get -16.77.

1b=-16.77

Divide each term in the equation by 1.

(1b)/(1)=-(16.77)/(1)

Cancel the common factor of 1.

b=-(16.77)/(1)

Divide -16.77 by 1 to get -16.77.

b=-16.77

#SPJ10

8 0
2 years ago
What is the value of the expression –4x3 when x = –2? A. –24 B. –32 C. 32 D. 24
timurjin [86]
Answer to your question would be 
c. 32
Because you would first have to multiply -4 and -2, and a negative times a negative times a negative equals a positive so -4 times -2 = 8 and then 8 times 3 equals 32 so the answer would be 32.
6 0
3 years ago
I need this question answered plz help.
wel

Answer:

a.12/13

Step-by-step explanation:

  • FORMULA: sine of an angle in a triangle is given by, \frac{opposite side's length}{length of the hypotenuse}
  • here, in the given triangle PQR, for angle 'p'

opposite side= QR

adjacent side= PQ

hypotenuse=PR

  • Therefore, sine of angle p= \frac{QR length}{PR length}  = \frac{12}{13}
  • Thus, by using the above given formula, the sine of angle p in the triangle PQR is 12/13.
  • hence, the trigonometric formulas as mentioned above should be remembered for sure to solve these type of problems

6 0
3 years ago
Please!!! help me which one is ???
marishachu [46]

Answer:

The answer is 150 degrees because you add 100 to the 50.

Step-by-step explanation:

3 0
3 years ago
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