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3 years ago

-2 √15 ( -3 √3 + 3 √5

Mathematics

1 answer:

aivan3 [116]3 years ago

8 0

Answer:
????
Explanation: can you explain what you want me to do?

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What is 7 3/4 minus 2 3 / 16

ycow [4]

Answer:

7 9/16 Or 5.5625

Step-by-step explanation:

7 3/4-2 3/16

So we first need a coment denominator

3/4×4= 12/16

now subtract everything.

7 12/16- 3/16=7 9/16 or 5.5625

5 0

3 years ago

Find the area of a triangle with a=20, b=30, and c=40

grin007 [14]

Answer:

option C is correct.

Step-by-step explanation:

The area of triangle with sides a, b and c can be found by using formula

$Area = \sqrt{s(s-a)(s-b)(s-c)} \\where \\s= \frac{1}{2}(a+b+c)$

We are given:

a= 20

b=30

c=40

<u>Finding s:</u>

Putting values in the formula and solving:

$s= \frac{1}{2}(a+b+c)\\s=\frac{1}{2}(20+30+40)\\s=\frac{90}{2}\\s= 45$

Now, <u>Finding the area</u>:

Putting values in the formula and solving:

$Area = \sqrt{s(s-a)(s-b)(s-c)}\\Area =\sqrt{45(45-20)(45-30)(45-40)}\\Area =\sqrt{45(25)(15)(5)}\\Area = \sqrt{84,375} \\Area = 290.5 units^2$

So, option C 290.5 units^2 is correct.

4 0

4 years ago

Please help me!!!!!!!!!

Elina [12.6K]

Answer:

Im sorry but I am not really sure myself ! I hope you find or found your answer already !

Step-by-step explanation:

6 0

3 years ago

Points..............

soldier1979 [14.2K]

Answer:

thanks...................

8 0

3 years ago

Read 2 more answers

Factor the expression 9x^2 - 30x + 25 I need help

MrMuchimi

Answer:

(3x - 5)²

Step-by-step explanation:

When we expand (3x - 5)², we get:

(3x - 5) (3x - 5)

When we multiply, we get:

9x² - 30x + 25

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Have a great summer :)

7 0

3 years ago