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Tanya [424]
3 years ago
11

PLS HELP ME ASAP FOR 42!! (MUST SHOW WORK!!) + LOTS OF POINTS!! *no calculator* *best if show work on picture*

Mathematics
1 answer:
Tpy6a [65]3 years ago
4 0
It's 2.5 bc it goes up by 2.5 everytime
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What is the solution of quadratic system of equations ?
kobusy [5.1K]

Answer:

(- 1, 1) and (- 5, - 35)

Step-by-step explanation:

since both equations express y in terms of x, equate the right sides

x² + 15x + 15 = - x² + 3x + 5 ( subtract - x² + 3x + 5 from both sides )

2x² + 12x + 10 = 0  ( divide all terms by 2 )

x² + 6x + 5 = 0 ← in standard form

(x + 1)(x + 5) = 0 ← in factored form

equate each factor to zero and solve for x

x + 1 = 0 ⇒ x = - 1

x + 5 = 0 ⇒ x = - 5

substitute these values into either of the 2 equations and solve for y

x = - 1 : y = (- 1)² + 15(- 1) + 15 = 1 - 15 + 15 = 1 ⇒ (- 1, 1 )

x = - 5 : y = (- 5)² + 15(- 5) + 15 = 25 - 75 + 15 = - 35 ⇒ (- 5, - 35 )

None of the given options



8 0
3 years ago
I really need help someone
Ann [662]

with what english, science anything i no it all

8 0
3 years ago
Plzz help no. 6 rate
Makovka662 [10]

Step-by-step explanation:

If 200 g fertiliser required for 8 m^2 then for 1m^2 we'd need 25 g of fertiliser

(i) 14×25 = 350 g fertiliser would be needed for 14 m^2 land

(ii) 450÷25 = 18 m^2 land could be fertilised with 450 g fertiliser

3 0
2 years ago
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