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3 years ago

Please answer as fast as you can...................................................................................

Mathematics

2 answers:

Firdavs [7]3 years ago

5 0

The answer is 35% ... your welcome

denpristay [2]3 years ago

5 0

The answer is A, 35%. .35 times 280 = 98. 280 - 98 = 182.

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Angela had a fully charged laptop

Korvikt [17]

Oh that's cool... what do i do?

4 0

3 years ago

Question 15 (5 points)<br> Find the angle between u = <7, -2> and v= (-1,2>.

Tema [17]

Answer:

Approximately $2.3127$ radians, which is approximately $132.51^{\circ}$ .

Step-by-step explanation:

Dot product between the two vectors:

$\begin{aligned}& u\cdot v \\ =\; & 7 \times (-1) + (-2) \times 2 \\ =\; & (-11) \end{aligned}$ .

Magnitude of the two vectors:

$\begin{aligned} \| u \| &= \sqrt{{7}^{2} + {(-2)}^{2}} \\ &= \sqrt{53} \end{aligned}$ .

$\begin{aligned} \| v \| &= \sqrt{{(-1)}^{2} + {2}^{2}} \\ &= \sqrt{5} \end{aligned}$ .

Let $\theta$ denote the angle between these two vectors. By the property of dot products:

$\begin{aligned} \cos(\theta) &= \frac{u \cdot v}{\|u\| \, \| v \|} \\ &= \frac{(-11)}{(\sqrt{53})\, (\sqrt{5})} \\ &= \frac{(-11)}{\sqrt{265}}\end{aligned}$ .

Apply the inverse cosine function ${\rm arccos}$ to find the value of this angle:

$\begin{aligned} \theta &= \arccos\left(\frac{u \cdot v}{\| u \| \, \| v \|}\right) \\ &= \arccos\left(\frac{(-11)}{\sqrt{265}}\right) \\ & \approx \text{$2.3127$ radians} \\ &= 2.3127 \times \frac{180^{\circ}}{\pi} \\ &\approx 132.51^{\circ}\end{aligned}$ .

8 0

2 years ago

A ladder is 8 metres long . It leans against a wall with one end on the

krek1111 [17]

Answer:

b=2√7 ≈ 5.29 meters

Step-by-step explanation:

think of it like a right triangle like in the picture with 8metre ladder as the hypotenuse

a²+b²=c²

6²+b² =8²

b²= 8²-6²=28

b=√28 =2√7 ≈ 5.29 meters

5 0

3 years ago

Which equation represents a proportional relationship? only 1

nadya68 [22]

Answer:

I think its b and c

Step-by-step explanation:

good luck

4 0

3 years ago

You are going to movies friday night (not a matinee). which of the theaters will cost the least, if you intend to have soda and

kolezko [41]

Q)You are going to movies Friday night. which of the theaters will cost the least, if you intend to have soda and popcorn?

Theater A Theater B Theater C

Adults $6.25 $7.25 $5.25

Children $3.50 $3.75 $4.25

Soda $2.00 $2.00 $2.50

Popcorn $2.50 $2.00 $2.50

Answer:

Theater B will cost less.

Step-by-step explanation:

The question here does not tell how many adults and children are going so we will only calculate the price for soda and popcorn for the theaters above.

For Theater A:-

$2.00 + $2.50 = $4.5

For Theater B:-

$2.00 + $2.00 = $4

For Theater C:-

$2.50 + $2.50 = $5

Hence Theater B will cost less.

7 0

4 years ago