3 years ago

How do you evaluate the trig expression sin(180°)?

1 answer:

3 0

I'm pretty sure you can only do it by calculator
Press the SIN button, open parentheses, 180, close parentheses,
And hit enter
Hope this helps :)

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Write (2x - 5)2 as a trinomial.

solniwko [45]

Answer:

$4x^2-20x+25$

Step-by-step explanation:

$(2x-5)^{2} \\(2x)^2+2(2x)(-5)+(-5)^2\\4x^2-20x+25$

7 0

3 years ago

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A student has a 2% salt water solution and a 7% salt water solution. To best imitate salt water at a local beach, he needs 1 lit

FromTheMoon [43]

Let

x-------> the amount of $2\%$ solution

y--------> the amount of $7\%$ solution

we know that

$2\%=0.02\\7\%=0.07\\3.5\%=0.035$

$x+y=1$

$y=1-x$ -------> equation A

$0.02x+0.07y=0.035$ -------> equation B

substitute equation A in equation B

$0.02x+0.07(1-x)=0.035$

$0.02x+0.07-0.07x=0.035$

$0.05x=0.035$

$x=0.7\ liters$

find the value of y

$y=1-x$

$y=1-0.7=0.3\ liters$

therefore

The student need $0.7\ liters$ of $2\%$ solution and $0.3\ liters$ of $7\%$ solution

the answer is

A) The percent values were written incorrectly in the equation

B) The amount of 7% solution should be written as 1 – x, not x – 1.

8 0

3 years ago

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If x= 4 and y=5 Find the value of x² + 4y 5

Sati [7]

Answer:

Step-by-step explanation:

x^2 + 4y = 16 + 20 = 32

Just do substitution.

Hope this helps.

Good Luck

3 0

3 years ago

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Solve. 6 divided by 2(1 + 2) = Ok goodluck please tell me the answer :)

dalvyx [7]

Answer:

Step-by-step explanation:

Based on the order of operations, this would be 3 times 3, which is 9 I think.

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3 years ago

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110 cm 50 cm 140cm 90 cm -110 cm - 70 cm

mihalych1998 [28]

Answer:

probably is 140 or is it just the whole question?

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3 years ago