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3 years ago

PLS give answer ASAP

Mathematics

2 answers:

exis [7]3 years ago

4 0

Answer: 3.5 pi.

Step-by-step explanation: Since we know the circumference formula of a circle is 2*pi*radius, we just have to substitute 7 in there, and divide by 4. So here ya go, 3.5 pi.

soldier1979 [14.2K]3 years ago

4 0

The answer is 3.5 pi
i hope i’m right if i’m wrong i apologize

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The perimeter of a rectangle is 42 inches, and its area is 110 square inches. find the length and width of the rectangle.

lorasvet [3.4K]

$p = 2w + 2l$ $p = 42$
$a = l * w$ $a = 108$

You want to make either the length or width variable (I chose the width variable to be by itself. It doesn't matter) by itself by:

Divide both sides by 2.
(p) ÷ 2 = (2w + 2l) ÷ 2
$2's$ $cancel$ $out$
$\frac{p}{2} = w + l$

Subtract both sides by either length or width depending on what variable you chose to make by itself (in this case I subtracted the length variable because I wanted the width variable by itself).
$\frac{p}{2} - l = w + l - l$
$l's$ $cancel$ $out$
p/2 - l = w

$a = l * w$

You replace w with the equation above p/2 - l = w
$a = l( \frac{p}{2} - l)$

Multiply out the L.
$a = \frac{p}{2}l - l^{2}$

Plug in all your numbers a = 110 and p = 42
$110 = \frac{42}{2}l - l^{2}$
$110 = 21l - l^{2$

Move everything to the left side so $l^{2}$ would be positive (makes the equation easier when $l^{2}$ is positive).
$l^{2} - 21l + 110 = 0$

Factor.
$(l -10)(l-11) = 0$

Make each parenthesis set equal to 0.
$l-11=0$ $l-10=0$

Add.
$l = 11$ $l = 10$

By doing this you solve for both the width and length so the answer is:
w = 11 L = 10

8 0

3 years ago

There is a group of student,1/3 are in elementary ,1/2 are in middle school and 15 are in high school. How many are in the group

OverLord2011 [107]

1/2 + 1/3 = 3/6 + 2/6 = 5/6
we have 5/6 so 15 is 1/6 of the entire group
15 × 6 = 90

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3 years ago

Which fraction below is equivalent to 10/12?

Effectus [21]

Answer:

5/6 or 10/12 are the same 0.83

Step-by-step explanation:

6/6-5/6=1/6 left 12/12-10/12=2/12 left

5 0

3 years ago

Help help help help help

Ugo [173]

Answer:

I'm pretty sure it's c but I'm not sure

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2 years ago

Given: AB / BC

Ahat [919]

1. given

2. perpendicular lines makes a right angle

5. definition of complementary angles

sorry bout the others. idk how to word it so hopefully what I gave you helps

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3 years ago