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3 years ago

PLEASE HELP!! I'LL GIVE YOU BRAINLIEST !!

Mathematics

1 answer:

Nostrana [21]3 years ago

3 0

Answer:

1.c

2.a

3.d

4.a

5.c

6.b

Step-by-step explanation:

sina=cos b

cosa= sin b

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What is the area of a triangle whose vertices are D(3, 3) , E(3, −1) , and F(−2, −5) ?

kirill [66]

We are given vertices of the triangle DEF as:

D(3, 3) , E(3, −1) , and F(−2, −5) .

Let us plot those points on the graph.

Formula of area of the triangle with vertices (x1,y1), (x2,y2) and (x3,y3).

Area = 1/2 [ (x2-x1)(y3-y1)-(x3-x1)(y2-y1)]

We have x1=3, x2=3, x3=-2, y1=3, y2 =-1 and y3 = -5.

Plugging values in formula, we get

Area = |1/2 [ 3-3)(-5-3)-(-2-3)(-1-3)]|

= |1/2 [ 0(-8) - (-5)(-4)]|

=| 1/2 [0 - 20]|

= |-10|

=10.

<h3>Therefore, area of the triangle with given vertices is 10 square units.</h3>

7 0

3 years ago

Find the measure of the missing angle. 122,79,90,Z

Alexxx [7]

The total amount of angles in quadrilateral is 360.so:

z=360-(122+79+90)
z=360-291
z=69

7 0

3 years ago

Please help asap! if you could also explain how you did it so I can answer the other questions by myself

Usimov [2.4K]

Answer:

Step-by-step explanation:

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3 years ago

**A rock dropped from a 100 foot tower.

mars1129 [50]

Answer:

2.83 s

Step-by-step explanation:

We are given that

$h(t)=-16t^2+10t+100$

When a rock reached the ground then h(t)=0

$-16t^2+10t+100=0$

$16t^2-10t-100=0$

Using quadratic formula

$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

$t=\frac{10\pm\sqrt{(-10)^2-4\times 16\times (-100)}}{2(16)}$

$t=\frac{10\pm\sqrt{100+6400}}{32}$

$t=\frac{10+\sqrt{6500}}{32}=2.83$

$t=\frac{10-\sqrt{6500}}{32}=-2.2$

Time cannot be negative .Therefore, negative value of t can not be possible.

Hence, the rock takes 2.83 sec to reach the ground.

8 0

4 years ago

Write a two column proof

Annette [7]

$4y=2x-10$ and $y=6$

use the second expression to calculate the left-hand side of the first equation:

$4\cdot 6 = 2x -10\\24 = 2x -10$

Add 10 to both sides if this equation to get

$34 = 2x$

and divide both sides by 2

$17 = x$

this proves that x = 17, give the two initial equations

8 0

3 years ago