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2 years ago

I need help solving 7 and 8 . I'm lost

Mathematics

1 answer:

gizmo_the_mogwai [7]2 years ago

3 0

In 8, sum of interior angles will be 180
Let BAC and OBA be x
2x + 85 = 180
x = 180-85 divide by 2
also angles BAC AND OBA are same because O is the centre of the circle and OA and OB are the radius

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A tourist first walked 17km with a speed of v km/h. Then he hiked 12 km uphill with the speed that was 2 km/hour less than his o

ExtremeBDS [4]

Answer: $t=\frac{17}{v}+\frac{12}{v-2}$

Step-by-step explanation:

Given: A tourist first walked 17km with a speed of v km/h.

Since $Speed=\frac{distance}{time}$

therefore, $Time=\frac{distance}{speed}$

Let $t_1$ be the time he walked with speed v.

then $t_1=\frac{17}{v}$

Also he hiked 12 km uphill with the speed that was 2 km/hour less than his original speed.

Let $t_2$ be the time he hiked 12 km,

Then $t_2=\frac{12}{v-2}$

The total time for the whole trip is given by:-

$t=t_1+t_2=$

Substitute the values of $t_1$ and $t_2$ in the equation, we get

$t=\frac{17}{v}+\frac{12}{v-2}$

4 0

3 years ago

Need some help here...

bekas [8.4K]

Cos Z = 32/40 => Z= cos-¹(32/40) =>

sin Z = sin (cos-¹(32/40)) = 3/5

4 0

2 years ago

What is the value of x in the equation below? 1/3(12x-24)=16

agasfer [191]

1/3(12x-24)=16
*3 *3
12x-24=48
+24 +24
12x=72
/12 /12

x=6

5 0

2 years ago

Read 2 more answers

What is the measure of А 50" 50° B C [Not drawn to scale] 50° 80 100 130

Paladinen [302]

Answer:

solution given :

<A=?

<B=50°

<C=50°

if it is a triangle:

<A+<B+<C=180°( sum of interior angle of a triangle is 180°)

<A=180-50-50

<A=80°

<A=80° is a required answer.

7 0

2 years ago

Factor the following :

Otrada [13]

Answer:

(x - 3)(x² + 4)

Step-by-step explanation:

x³ - 3x² + 4x - 12 ( factor first/second and third/fourth terms )

= x²(x - 3) + 4(x - 3) ← factor out (x - 3 from each term

= (x - 3)(x² + 4)

8 0

2 years ago