I need help! What should I do?!

Mathematics

1 answer:

larisa [96]4 years ago

4 0

So, to find the area of a triangle we use the formula

a=1/2bh

So to find the base measure across the bottom line.
And to find the height, measure the length of the sitter line (the one in the middle spanning from top to bottom)

We then multiply the base and the height

After that we take the answer we got from multiplying the base and the height and divide it by 2

And the number you get after you divide it by 2 is the area of the triangle.

So, we know the base of the triangle is 6cm and the height is 2cm
Then we do 6×2=12
12/2=6

So the area is 6cm
and the number closest to 6 is 12
So your answer should be A

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A total of $6000 was invested, part of it at 3% interest and the remainder at 8%. If the total yearly interest amounted to $380,

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$ 2000 is invested at 3 % interest and $ 4000 is invested at 8 % interest

Solution:

Given that, total of $6000 was invested

Let "x" be the amount invested at 3 % interest

Then, (6000 - x) is the amount invested at 8 % interest

Given that,

The total yearly interest amounted to $380

Then, we can frame a equation as:

$x \times 3 \% + (6000 - x) \times 8 \% = 380$

Solve the above expression for "x"

$x \times \frac{3}{100} + (6000-x) \times \frac{8}{100} = 380\\\\0.03x + (6000-x) \times 0.08 = 380\\\\0.03x + 480 - 0.08x = 380\\\\-0.05x = -100\\\\\text{Divide both sides by -0.05 }\\\\x = 2000$