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3 years ago

To E F A. Triangle A B. Triangle B C. Triangle C D. Triangle D

Mathematics

1 answer:

iogann1982 [59]3 years ago

4 0

Answer:

B,D,and F

Step-by-step explanation:

I hope this helps you

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Pls help pls pls pls pls

andriy [413]

5/? = 15/45

15/3 / 45/3

5/15

? = 15

8 0

3 years ago

Read 2 more answers

A student measured the lead content of a paint sample 4 times. The standard deviation of the measurements was found to be 0.76%

Lady_Fox [76]

Answer:

$CI =0.894%$

Step-by-step explanation:

From the question we are told that:

Sample size $n=4$

Standard deviation $\sigma=0.76\% of \=x$

Confidence level $\mu =90\%=0.90$

Degree of Freedom $Df=n-1=3$

Therefore

Test T from table is given

$t=2.353$

Generally the equation for Confidence interval CI is mathematically given by

$CI =t*\frac{\sigma}{\sqrt{n}}$

$CI =2.353*\frac{0.76}{\sqrt{4}}$

$CI =0.894%$

6 0

3 years ago

What are the values of a and b

makvit [3.9K]

Answer:

$\large\boxed{B.\ a=8,\ b=4\sqrt5}$

Step-by-step explanation:

We have three similar triangles:

$\triangle ABC\sim\triangle DBA\sim\triangle DAC$

therefore the sides are in proportion:

$\dfrac{AD}{CD}=\dfrac{BD}{AD}$

We have AD = a, CD = 16 and BD = 4. Substitute:

$\dfrac{a}{16}=\dfrac{4}{a}$ cross multiply

$(a)(a)=(16)(4)\\\\a^2=64\to a=\sqrt{64}\\\\a=8$

and other proportion:

$\dfrac{AB}{BC}=\dfrac{BD}{AB}$

We have AB = b, BC = 16 + 4 = 20 and BD = 4. Substitute:

$\dfrac{b}{20}=\dfrac{4}{b}$ cross multiply

$(b)(b)=(20)(4)\\\\b^2=80\to b=\sqrt{80}\\\\b=\sqrt{16\cdot5}\\\\b=\sqrt{16}\cdot\sqrt{5}\\\\b=4\sqrt{5}$

3 0

3 years ago

Unit 4 Ratio, Proportions, & Percent Homework 7th Grade

kolbaska11 [484]

Answer:the answer to the question below equals one hundred eleven

Step-by-step explanation:

3 0

3 years ago

8.9. A taco stand sells tacos for $3.25 each. The stand’s expenses for the day are $210. Define your variables and write an ineq

MatroZZZ [7]

The inequality for this problem would be 3.25x > 210 with x representing the number of tacos sold per day. The answer to this inequality would be x = 65 (actually 64.61 but you can't sell half a taco). The taco stand needs to sell at least 65 tacos a day to make a profit.

7 0

4 years ago