Mathematics: Can you all please help me ? Test

Can you all please help me ? Test - id8908051, jarryd4202

Ответ:

sophiaa23

12.11.2020

Mathematics

x = 11

Step-by-step explanation:

If two angles form a linear pair, they are supplementary.

$\rm \longrightarrow (7x - 1) \degree + (9x + 5) \degree = 180 \degree \\ \\ \rm \longrightarrow 7x - 1 + 9x + 5 = 180 \\ \\ \rm \longrightarrow 16x + 4 = 180 \\ \\ \rm Subtract \: 4 \: from \: both \: sides: \\ \rm \longrightarrow 16x + 4 - 4= 180 - 4 \\ \\ \rm \longrightarrow 16x = 176 \\ \\ \rm Divide \: both \: sides \: by \: 16: \\ \rm \longrightarrow x = \dfrac{176}{16} \\ \\ \rm \longrightarrow x = 11$

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Ответ:

rodfam13716

02.03.2022

Mathematics

The discriminant tells us how many real solutions there are. Since the parabola doesn't have any x-intercepts, the discriminant is less than zero, and therefore is answer A.

If a discriminant is:
>0, there are 2 x-intercepts
=0, there is 1 x-intercept
<0, there are no x-intercepts

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