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3 years ago

Eric Kweeder can paint a wall in

2 answers:

8 0

Not sure if this is college math and what you're even asking, but if I'm understanding it right, it takes Eric 30 30 minutes. meaning 900 minutes. It takes his brother 20 20 minutes meaning 400 minutes. You're asking for the average time with them working together so 900+400=1300, 1300/2=650. It takes them 650minutes working together. 650 isn't a perfect square so I'd rather not expand on that part.

pentagon [3]3 years ago

4 0

The answer of the question is 12minutes

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-3 is which type of number? Select all that apply.

alexgriva [62]

It is an integer and a rational number

6 0

3 years ago

Read 2 more answers

Increase £600 by 15%?

SIZIF [17.4K]

You will have to multiply 600 by 15%

600 x 0.15 = 90
600 + 90 = 690 Euro

8 0

3 years ago

Read 2 more answers

Find sin 2a and cot 2a:

geniusboy [140]

Answer:

$sin(2\alpha )=2(\frac{5}{12})(\frac{12}{13})=\frac{10}{13}\\cot(2\alpha ) = \frac{16511}{18720}$

Step-by-step explanation:

$\text{if } cos(\alpha)=\frac{12}{13}\\\text{That must mean we have a triangle with base 12, and hypotenuse 13.}\\\text{Using Pythagoras, we can determine the base of the triangle must be 5.}\\a^2+b^2=c^2 \text{, where c is the hypotenuse and a, b are the two other sides.}\\c^2-b^2=a^2\\\sqrt{c^2-b^2}=a\\\sqrt{13^2-12^2}=\sqrt{169-144}=\sqrt{25}=5\\\text{Therefore, }sin(\alpha) = \frac{5}{12}\\sin(2\alpha)=2sin(\alpha )cos(\alpha)\\\text{(From double angle formulae identities)}\\$

$sin(2\alpha )=2(\frac{5}{12})(\frac{12}{13})=\frac{10}{13}\\cos(2\alpha )=cos^2(\alpha)-sin^2(\alpha)\\cos(2\alpha )=(\frac{12}{13})^2-(\frac{5}{12})^2=\frac{16511}{24336}\\cot(2\alpha)=\frac{cos(2\alpha)}{sin(2\alpha)}=\frac{\frac{16511}{24336}}{\frac{10}{13}}=\frac{16511}{18720}$

8 0

2 years ago

Write another expression equivalent to 2(x + 3) please answer i will make you brainliest

inna [77]

Answer:

2x + 6

Step-by-step explanation:

distribution

plz mark branliest

6 0

3 years ago

Your princpal has decided to provide a treat to everyone in your grade before thanksgiving break-ice cream bars! One box contain

Assoli18 [71]

Answer:

8 boxes approx

Step-by-step explanation:

Step one:

given data

One box contains 48 bars

Required

The number of boxes needed for a total of 338 students if each person is to get at least one bar.

Step two:

this can be gotten by dividing 338 by the number of the bar in a box

= 338/48

=7.04

=8 boxes approx

He needs to purchase at least 8 box

4 0

3 years ago