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3 years ago

Please help, I will give brainliest, I am struggling badly.

Mathematics

2 answers:

Nastasia [14]3 years ago

5 0

Answer:

im pretty sure the answer is "infinite solutions" hope this helps

Amanda [17]3 years ago

4 0

Answer:

Step-by-step explanation:

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Which ray is oppisite to ED

Lerok [7]

You don't have a picture here , but try to see if any ray are maybe parralell .

Hope this helps!

3 0

3 years ago

A map is drawn using a scale of 1cm/80 mi

yulyashka [42]

Answer:

280/80 = 28/8 = 7/2 = 3.5 cm

Step-by-step explanation:

the ratio is 1cm/80mi = a cm/280mi

so you get 280cm * mi = 80mi*a cm

so a = 280/80 = 3.5

8 0

3 years ago

A cash register contains $20 bills and $100 bills with a total value of $1460. If there are 21 bills total, then how many of

ella [17]

The register contains 8 number of $20 bills and 13 number of $100 bills.

<h3>What is termed as the linear equation in two variables?</h3>

A linear equation in two variables is one that is written in the form ax + by + c=0, where a, b, and c are real numbers as well as the coefficients of x and y, i.e. a and b, are not equal to zero.

Let 'x' be the of $20 bills.

Let 'y' be of $100 bills.

Total bill = 21

x+y = 21

y = -x+21 ......eq1

Now,

Total price = $1460.

20x + 100y = 1460

Put value of y from eq 1.

20x + 100(-x+21) = 1460

20x-100x+2100=1460

-80x=-640

x=8 (Number of $20 bill)

And,

-8+21=13

y=13 (Number of $100 bills)

Thus, the register contains 8 number of $20 bills and 13 number of $100 bills.

To know more about linear equation, here

brainly.com/question/4074386

#SPJ1

The complete question is-

A cash register contains $20 bills and $100 bills with a total value of $1460. If there are 21 bills total, then how many of each does the register contain?

8 0

2 years ago

HELP AND PLZ EXPLAIN PLZZZZZZZZZZZZZZZZZZZZZZZZZZZZzz

Yakvenalex [24]

Here, you're mixing scores 85 and 90 with weights X and Y, respectively. You are asked for the ratio of X to Y.

There's a quick way to work mixture problems of all kinds. Write the two components of the mixture on the left. Here, they are 90 and 85. (I usually put the larger one on top.) Put the mixed value in the middle, and form differences along the lines of an X, as shown. The numbers on the right give the relative contributions of the constituents at the same level in the diagram. Here, the ratio of X to Y is shown as 2 to 3.

For some mixture problems, you need to know the proportion of the constituent to the whole. In that case, add the ratio values to get the "whole". For example, here the X class students make up 2/(2+3) = 2/5 of the whole number of students.

For your problem, X/Y = 2/3, corresponding to selection D.

7 0

3 years ago

You always need some time to get up after the alarm has rung. You get up from 10 to 20 minutes later, with any time in that inte

Mama L [17]

Answer:

a) P(x<5)=0.

b) E(X)=15.

c) P(8<x<13)=0.3.

d) P=0.216.

e) P=1.

Step-by-step explanation:

We have the function:

$f(x)=\left \{ {{\frac{1}{10},\, \, \, 10\leq x\leq 20 } \atop {0, \, \, \, \, \, \, otherwise }} \right.$

a) We calculate the probability that you need less than 5 minutes to get up:

$P(x$

Therefore, the probability is P(x<5)=0.

b) It takes us between 10 and 20 minutes to get up. The expected value is to get up in 15 minutes.

E(X)=15.

c) We calculate the probability that you will need between 8 and 13 minutes:

$P(8\leq x\leq 13)=P(10\leqx\leq 13)\\\\P(8\leq x\leq 13)=\int_{10}^{13} f(x)\, dx\\\\P(8\leq x\leq 13)=\int_{10}^{13} \frac{1}{10} \, dx\\\\P(8\leq x\leq 13)=\frac{1}{10} \cdot [x]_{10}^{13}\\\\P(8\leq x\leq 13)=\frac{1}{10} \cdot (13-10)\\\\P(8\leq x\leq 13)=\frac{3}{10}\\\\P(8\leq x\leq 13)=0.3$

Therefore, the probability is P(8<x<13)=0.3.

d) We calculate the probability that you will be late to each of the 9:30am classes next week:

$P(x>14)=\int_{14}^{20} f(x)\, dx\\\\P(x>14)=\int_{14}^{20} \frac{1}{10} \, dx\\\\P(x>14)=\frac{1}{10} [x]_{14}^{20}\\\\P(x>14)=\frac{6}{10}\\\\P(x>14)=0.6$

You have 9:30am classes three times a week. So, we get:

$P=0.6^3=0.216$

Therefore, the probability is P=0.216.

e) We calculate the probability that you are late to at least one 9am class next week:

$P(x>9.5)=\int_{10}^{20} f(x)\, dx\\\\P(x>9.5)=\int_{10}^{20} \frac{1}{10} \, dx\\\\P(x>9.5)=\frac{1}{10} [x]_{10}^{20}\\\\P(x>9.5)=1$

Therefore, the probability is P=1.

3 0

3 years ago