All categories

4 years ago

Please help me with this

Mathematics

2 answers:

Mamont248 [21]4 years ago

7 0

Since ABC is equal to DCB, you can use the angles given in triangle ABC in triangle DCB. Since the sum of the angles in a triangle is 180, the equation would be this:
90+46+x=180

Solve for x in that and you're good :)

Klio2033 [76]4 years ago

5 0

Use trig so the side with 4x-7 is also equal to 21sin(46)=15 so 4x-7=15.1. thus x=5.52 which is around 6

You might be interested in

5-(n-4)=3(n+2)<br> Please help I’ll give brainliest

DedPeter [7]

If your salving for n it would be n=0.75
If your salving by factoring it is 3/4

4 0

3 years ago

A Web music store offers two versions of a popular song. The size of the standard version is

sashaice [31]

Let s be standard and h be high-quality versions of the song.
To figure this out, let's make a system of equations:
2.5s + 4.5h = 5740
h = 4s
First substitute the second equation into the first for h.
2.5s + 18s =5740
Then combine like terms.
20.5s = 5740
Lastly, divide each side by 20.5 to get the number of standard downloads:
s = 280
Hope this helps!

8 0

4 years ago

The circular base of a cone has a radius of 5 centimeters. The height of the cone is 12 centimeters, and the slant height is 13

shepuryov [24]

Answer:

Hence, the surface area of cone is:

282.6 cm^2 which is approx 283 cm^2.

Step-by-step explanation:

We are given:

The circular base of a cone has a radius of 5 centimeters.

i.e. r=5 cm.

The height of the cone is 12 centimeters

i.e. h=12 cm.

The slant height is 13 centimeters.

i.e. l=13 cm.

Now we know that the surface area(S.A.) of cone is given by:

$S.A.=\pi r(l+r)$

Hence by putting the value of l,r and π in the formula we get:

$S.A.=3.14\times 5\times (13+5)\\\\S.A.=15.7\times 18\\\\S.A.=282.6$

Hence the surface area of cone is 282.6 cm^2 which is approx 283 cm^2.

4 0

3 years ago

Read 2 more answers

What type of transformation is performed when the pre-image is "flipped" over a line? translation

vivado [14]

Reflection is when the pre-image is flipped over a line.

8 0

4 years ago

Read 2 more answers

A researcher would like to estimate the proportion of all children that have been diagnosed with Autism Spectrum Disorder (ASD)

aliina [53]

Answer:

The researcher should use a sample size of at least 140 children to get a margin of error to be within 2%.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence interval $1-\alpha$ , we have the following confidence interval of proportions.