3 years ago

Ill give brainliest please help with these formulas!! (show work)

Mathematics

1 answer:

lesya692 [45]3 years ago

4 0

Answer:. for number 1 is height

Step-by-step explanation:

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Lf R(x) = x2 – 3x – 1, find R(-2). a.9 b.-9 c.-3 d.-11

fenix001 [56]

Answer:

Step-by-step explanation:

If R(-2), then x = -2. Just plug in -2 for x. -2^2 - 3(-2) - 1 = 4 + 6 - 1 = 10 - 1 = 9. The answer is 9.

6 0

3 years ago

What is the area of the sector with a central angle of 49° and a radius of 11 cm? Use 3.14 for pi and round your final answer to

olga_2 [115]

Answer:

$\boxed{\text{51.71 cm}^{2}}$

Step-by-step explanation:

If the angle θ is in radians, the formula for the area (A) of a sector of a circle is

A = ½r²θ

If θ is in degrees

$A = \dfrac{1}{2}r^{2}\theta \times \dfrac{\pi \text{ rad}}{180^{\circ}}= \pi r^{2}\times\dfrac{\theta }{360}$

Data:

θ = 49°

r = 11 cm

Calculation:

$\begin{array}{rcl}A& = &3.14\times 11^{2}\times\dfrac{49}{360}\\\\ & = &3.14 \times 121 \times 0.1361\\ & = & \mathbf{51.71}\\\end{array}\\\text{The area of the sector is }\boxed{\textbf{51.71 cm}^{2}}$

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3 years ago

What is the circumstances of a circle that has a diameter of 15

zheka24 [161]

C=(3.14)(15)
you multiply and get 47.1

7 0

3 years ago

Ppplllzzz hhhheeelllllllpppppp

timama [110]

Answer:

Step-by-step explanation:

Formula: 1/2bh

An isosceles triangle has at least 2 sides equal, so the blank side is 13.

base=10

height=13

13*10=130

half of that is 65

5 0

3 years ago

Sales tax on an item directly proportional to the cost of the items purchased. If the tax on a $400 item is $24, what is the sal

ArbitrLikvidat [17]

Answer:

$21

Step-by-step explanation:

This can be easily solved by fraction 400/24=350/x

x=$21

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3 years ago