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Kaylis [27]
3 years ago
5

2nd attempt at this question please answer right. 2 images below:

Mathematics
2 answers:
damaskus [11]3 years ago
8 0

Answer:

15.75

Step-by-step explanation:

The formula for the area of a triangle is A=1/2BH (Half base times height)

Do the calculation using a calculator

Area= 1/2 x 9 = 4.5

Area= 4.5 x 3.5 = 15.75

zhenek [66]3 years ago
3 0

Answer:

idk what yah do right there brah what grade u in

Step-by-step explanation:

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Please prove this........​
Crazy boy [7]

Answer:  see proof below

<u>Step-by-step explanation:</u>

Given: A + B + C = π    →     C = π - (A + B)

                                    → sin C = sin(π - (A + B))       cos C = sin(π - (A + B))

                                    → sin C = sin (A + B)              cos C = - cos(A + B)

Use the following Sum to Product Identity:

sin A + sin B = 2 cos[(A + B)/2] · sin [(A - B)/2]

cos A + cos B = 2 cos[(A + B)/2] · cos [(A - B)/2]

Use the following Double Angle Identity:

sin 2A = 2 sin A · cos A

<u>Proof LHS → RHS</u>

LHS:                        (sin 2A + sin 2B) + sin 2C

\text{Sum to Product:}\qquad 2\sin\bigg(\dfrac{2A+2B}{2}\bigg)\cdot \cos \bigg(\dfrac{2A - 2B}{2}\bigg)-\sin 2C

\text{Double Angle:}\qquad 2\sin\bigg(\dfrac{2A+2B}{2}\bigg)\cdot \cos \bigg(\dfrac{2A - 2B}{2}\bigg)-2\sin C\cdot \cos C

\text{Simplify:}\qquad \qquad 2\sin (A + B)\cdot \cos (A - B)-2\sin C\cdot \cos C

\text{Given:}\qquad \qquad \quad 2\sin C\cdot \cos (A - B)+2\sin C\cdot \cos (A+B)

\text{Factor:}\qquad \qquad \qquad 2\sin C\cdot [\cos (A-B)+\cos (A+B)]

\text{Sum to Product:}\qquad 2\sin C\cdot 2\cos A\cdot \cos B

\text{Simplify:}\qquad \qquad 4\cos A\cdot \cos B \cdot \sin C

LHS = RHS: 4 cos A · cos B · sin C = 4 cos A · cos B · sin C    \checkmark

7 0
3 years ago
Need help with math problem give 5 stars and brain thingy point
Nadusha1986 [10]

Answer:

There are 12 sections, out of the 12 sections the third section is marked. So that would be, 3/12 which simplifies to 1/4

5 0
2 years ago
Read 2 more answers
The ratio of the number of girls to the number of boys in a choir is 5 to 4. There are 120 girls in the choir. How many boys are
Alexxx [7]

Answer:

96

Step-by-step explanation:

5:4

Both sides have to be equal.

120 divided by 5 is 24.

4 times 24 is <u>96</u>.

4 0
3 years ago
Please HELPPPP ILL MAKE BRAINLIEST
lutik1710 [3]

Answer:

36 feet

Step-by-step explanation:

3ft is 1 yard so you would multiply the 12 yards by 3 making 36.

5 0
3 years ago
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The mean of a data set is equal to 10 and its standard deviation is equal to 1. If we add 5 to each data value, then the mean an
aksik [14]

Say we add 5 to each element. We sum them up and divide by the number of elements (compute mean). Well we added 5n to that total sum and are dividing by n. So if the mean was 10 before, now it’s 15. (We had 10 datapoints added too 100, but we added 50, dividing by 10 we get 15).

Now every single data point is just as close to the mean as it was before. The mean shifted with 5, but so did the datapoints. Remember, variance is the sum of squared errors divided by n, or n-1 for sample. Well, the sum of squared errors did not change. So our estimate of variance remains the same as well as our estimate of standard deviation.

This is without assuming normality. (ie through the equation of mean and standard deviation themselves). In general expected values shift with constants, and variances remain stable.

7 0
3 years ago
Read 2 more answers
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