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3 years ago

Solve x2+x-1=0 using the quadratic formula.

Mathematics

1 answer:

weeeeeb [17]3 years ago

6 0

Answer:

x = $\frac{-1 ±\sqrt{5} }{2}$

Step-by-step explanation:

Ignore the A that doesn't belong in the answer

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There is a proportional relationship between your distance from a thunderstorm and the time from when you see the lightning and

eimsori [14]

Answer:

Yes.

Step-by-step explanation:

The relation would be 3 = k*9 as there is a direct proportional relationship.

So k = 3/9 = 1/3 and we can write the relation as d = 1/3 t where d=distance and t = time.

So if we double the time t we have:-

d = 1/3 * 18

= 6 kilometers.

So the distance is doubled.

3 0

2 years ago

Find the missing side. Round to the nearest tenth.

AnnZ [28]

Answer:

B. 29.5

Step-by-step explanation:

Cos=A/H

=12/x

x=12/cos66

4 0

2 years ago

RectangleABCD has vertices at A(– 3, 1),B(– 2, – 1),C(2, 1), andD(1, 3). What is the area, in square units, of this rectangle? A

Anna [14]

Answer:

Option A. $10\ units^{2}$

Step-by-step explanation:

we know that

The area of the rectangle is equal to

A=LW

where

L is the length of rectangle

W is the width of rectangle

we have

$A(-3,1),B(-2,-1),C(2,1),D(1,3)$

Plot the vertices

see the attached figure

L=AD=BC

W=AB=DC

the formula to calculate the distance between two points is equal to

$d=\sqrt{(y2-y1)^{2}+(x2-x1)^{2}}$

Find the distance AD

$A(-3,1),D(1,3)$

substitute in the formula

$AD=\sqrt{(3-1)^{2}+(1+3)^{2}}$

$AD=\sqrt{(2)^{2}+(4)^{2}}$

$AD=\sqrt{20}$

$AD=2\sqrt{5}\ units$

Find the distance AB

$A(-3,1),B(-2,-1)$

substitute in the formula

$AB=\sqrt{(-1-1)^{2}+(-2+3)^{2}}$

$AB=\sqrt{(-2)^{2}+(1)^{2}}$

$AB=\sqrt{5}$

$AB=\sqrt{5}\ units$

Find the area

$A=(2\sqrt{5})*(\sqrt{5})=10\ units^{2}$

4 0

3 years ago

Identify the stem of the following number: 231. A. 1 B. 2 C. 3 D. 23

Kruka [31]

stem = 23
leaf = 1

Answer is choice D

The leaf is always a single digit because you can have multiple leaves without any separating mark. If you have something like "123" on the leaf column, then that means you have three leaves of 1, 2 and 3 which correspond to the same stem.

8 0

3 years ago

What is the solution of this equation -12x-7=53

umka21 [38]

Answer:

x = -5

Step-by-step explanation:

You have to work backwards.

53 + 7 = 60

60 ÷ 12 = 5

Add the negative »»» -5

8 0

2 years ago

Read 2 more answers