please help me!! pel​

Answer:

1. 48

2. 45

3. 32

4. B

Step-by-step explanation: Hope this help :D

Use Heron's formula.

A = sqrt{(s - a)*s - b)(s - c)}, where a, b, and c represent the sides of the triangle.

We need to find s first.

So, s = (a + b + c)/2.

s = (13 + 6 + 9)/2

s = 28/2

s = 14

We now plug everything into the Heron's area formula.

A = sqrt{(14 - 13)(14 - 9)(14 -6)}

A = sqrt{(1)(5)(8)}

A = sqrt{40}

A = 6.3245553203

Let us now round to one decimal place as instructed. We round to the tenths place, in other words.

A = 6.3 cm^2

Did you follow?

Answer:

Step-by-step explanation:

Let the smallest number = x

The next number will be x + 1

x + x + 1 = 5

2x + 1 = 5          This is likely the answer to the question although it could be the equation above.

Answer:

sin 47° = 0.731

Step-by-step explanation:

the complementary angle to 43° is 47°

sin 47° = 0.731

Answer:

0.731

Step-by-step explanation:

Because of the identity

cos x = sin(90-x).

Answer:

Only 2

Step-by-step explanation:

1 is a binomial.

2 is a trinomial, and the first and last numbers are perfect squares (1 and 16)

Answer:

146 whistles

Step-by-step explanation:

First, convert 122 feet to inches, by multiplying it by 12

122(12)

= 1464

Divide this by 10 to find how many whistles he can make

1464/10

= 146.4

Since we can only have a whole number of whistles, we have to round down to 146.

So, he can make 146 whistles

Answer:

5.5

Step-by-step explanation:

Answer:

Choice B

y = -450x +18,000

Step-by-step explanation:

18,000 = b

descent rate = 450 = m

x = minutes

Answer:

$270

Step-by-step explanation:

35%= 0.35

200*0.35 =70

He saves $70 more.

Altogether saves $270

Answer:

x = 63.43...

Step-by-step explanation:

Ok, so the angle x is the same measure as the bottom right angle of the triangle because the bottom of the triangle and the dashed line are parallel. Knowing this we can simply solve for the bottom right angle and it will be the same as angle x.

To do this we can set up and equation with tangent because we are working with the opposite and adjacent sides of the triangle.

[tex]Tan(x) = \frac{opposite}{adjacent} = \frac{50}{25} = 2[/tex]

[tex]Tan(x)=2\\[/tex]

Now to isolate the variable, we can simply use the cotangent or inverse tangent.

[tex]Tan^{-1}(Tan(x)) = Tan^{-1}(2)\\x = Tan^{-1}(2)\\x = 63.43...[/tex]

Corresponding angles on parallel lines cut by a transversal are equal

5x + 30 = 3x + 60

Subtract 3x from both sides

2x + 30 = 60

Subtract 30 from both sides

2x = 30

Divide both sides by 2

X = 15

Answer:

the leg is 6.9

Step-by-step explanation:

use the reverse Pythagorean therm

find the square root of 8(squared) - 4(squared) =6.9

Answer:

-1.52

Step-by-step explanation:

-2+0.48=-1.52

Answer:

a) The golf ball reaches a height of 64 feet.

b) The golf ball will take 2 seconds to reach maximum height.

c) The golf ball will take 4 seconds to land after being hit.

d) The golf ball will be 48 feet above ground 1 and 3 seconds after being hit.

Step-by-step explanation:

a) The parabolic motion of the golf ball is described by a second order polynomial, that is, the equation of the parabola. To determine the maximum height of the golf ball, we need to transform the equation of the parabola given into vertex form:

[tex]h = -16\cdot (t^{2}-4\cdot t)[/tex]

[tex]h - 64 = -16\cdot (t^{2}-4\cdot t + 4)[/tex]

[tex]h - 64 = -16\cdot (t-2)^{2}[/tex]

From this form we can obtain relevant information of the maximum height of the golf ball, contained in the left side of the equation. On this approach, we conclude that the golf ball reaches a height of 64 feet.

b) The time taken by the golf ball is contained in the right side of the formula. That is, the golf ball will take 2 seconds to reach maximum height.

c) In this case, we need to factor the polynomial to find right times, that is:

[tex]h = 64\cdot t - 16\cdot t^{2}[/tex]

[tex]h = 16\cdot t \cdot (4 - t)[/tex]

The time taken by the golf ball to land is contained in the second binomial. In a nutshell, the golf ball will take 4 seconds to land after being hit.

d) If we know that [tex]h = 48[/tex], the time taken by the golf ball to be 48 feet above the ground is:

[tex]64\cdot t - 16\cdot t^{2} = 48[/tex]

[tex]16\cdot t^{2}-64\cdot t +48 = 0[/tex]

By Quadratic Formula, we have the following roots:

[tex]t_{1} = 3[/tex], [tex]t_{1} = 1[/tex]

The golf ball will be 48 feet above ground 1 and 3 seconds after being hit.

Answer:

x < 19

Step-by-step explanation:

Given that,

An inequality 2x - 5 < 33.

LHS of the inequality is 2x - 5

RHS of the inequality is 33

LHS < RHS

i.e.

2x - 5 < 33

Add 5 to both sides of the inequality

2x - 5 +5 < 33+5

2x < 38

Divide both sides by 2.

x < 19

So, the value of x is less than 19.

Answer:

English and French:40 and English:10

Step-by-step explanation:

English and French:4÷5×50

=40

English:1÷10×50

=10

Answer:

A = 139.5 cm^2

Step-by-step explanation:

Ok, let's break it down into pieces. First let's find the area of the main rectangle. We know that the area of a rectangle is as follows:

A = L x W

A = 9 x 12

A = 108 cm^2

Now we need to find the area of the two triangles. There are two ways to approach this. If you can visualize that you can flip the first triangle and slide it against the second, it becomes a rectangle. Then you can simply use the same formula as before with modified numbers.

L = 7 (height of the triangle

W = 4.5 (base of the triangle (half of 9))

A (both triangles) = 7 x 4.5

A (both triangles) = 31.5 cm^2

If you can't quite figure out how to visualize that, you can simply treat them as two independent right triangles. The formula for the area of a right triangle is as follows:

A = (1/2)b x h

b = 4.5

h = 7

A (first triangle) = (1/2)4.5 x 7

A (first triangle) = 15.75 cm^2

The area of the second triangle is identical

A (second triangle) = 15.75 cm^2

The area of the two triangles added together is

A (both triangles) = A (first triangle) + A (second triangle)

A (both triangles) = 31.5 cm^2

As you can see we got the same answer both ways. Now we just have to add the area of the two triangles to the area of the rectangle

A = 108 + 31.5

A = 139.5 cm^2

Answer:

A

Step-by-step explanation:

The theorem we use for this is

[tex]a(a + b) = c(c + d)[/tex]

Solve for d.

[tex]a(a + b) = c { }^{2} + cd[/tex]

[tex]a(a + b) - {c}^{2} [/tex]

[tex] \frac{a(a + b) - {c}^{2} }{c} [/tex]

A is the answer

Answer:

(-0.607 ; 1.757)

Step-by-step explanation:

Student: __ 1 ___ 2 ___ 3 ___ 4

Fall _____2.6__ 3.0__ 1.5 __1.4

Spring___ 1.7__ 2.2 __1.4 __0.90

Using calculator :

Fall:

Xbar1 = 2.125

Sample size, n1 = 4

Standard deviation, s1 = 0.8

Spring :

Xbar2 = 1.55

Sample size, n2 = 4

Standard deviation, s2 = 0.54

Confidence interval :

(xbar1 - xbar2) ± Tcritical * Sp* √1/n1 + 1/n2

Sp = √[(df1*s1² + df2*s2²) ÷ (n1 + n2 - 2)]

df = n - 1

(xbar1 - xbar2) = 2.125 -1.55 = 0.575

Hence,

Sp = √(((3*0.8^2) + (3*0.54^2)) / 6)

Sp= √2.7948 ÷ 6

Sp = √0.4658

Sp= 0.682

Tcritical at 95%, df = 4 = 2.45

Error margin = 2.45 * 0.682 * √1/4 + 1/4 = 1.182

Confidence Interval:

Lower boundary = 0.575 -1.182 = -0.607

Upper boundary = 0.575 + 1.182 = 1.757

(-0.607 ; 1.757)

Answer:

32 times

Step-by-step explanation:

4/5:x/40 ----x=32

Answer:

B -13

Step-by-step explanation:

Answer:

-13

Step-by-step explanation:

hope it helps you.good day

Answer:

y = -4x + 15

Step-by-step explanation:

y +1 = -4x(-4)

y +1 = -4x +16

y = -4x +15

Answer:

y = -4 + 15

Hope that this helps!

Answer:

119

Step-by-step explanation:

14x17 = 238)/2

Step-by-step explanation:

ratio 6:8

376+336=712

6+8=14

712/14=50.86

haircut= 50.86*6=305.16

colour= 50.86*8=406.88

i hope this helps

Answer: [tex]792\ m^2[/tex]

Step-by-step explanation:

Given

The length of the rectangular prism is [tex]l=12\ m[/tex]

width of the rectangular prism is [tex]w=8\ m[/tex]

height of the rectangular prism is [tex]h=15\ m[/tex]

The surface area of the rectangular prism is [tex]2[wl+lh+hw][/tex]

Put the values

[tex]\Rightarrow 2[8\times 12+15\times 12+15\times 8]\\\Rightarrow 2[96+180+120]=2\times 396\\\Rightarrow 792\ m^2[/tex]

The surface area of the rectangular prism is [tex]792\ m^2[/tex]

Answer:

Step-by-step explanation:

x²-2x=-26

add both sides (-2/2)² or 1

x²-2x+1=-26+1

x²-2x+1=-25

(x-1)²=25×-1

(x-1)²=5²×i²=(5i)²

x-1=±5i

x=1±5i

Answer:

Step-by-step explanation:

Answer:

11,7,5,3

Step-by-step explanation:

thats all thank you