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3 years ago

I don't understand my math class..and she left me with this problem. So how do I solve this?

Mathematics

1 answer:

Igoryamba3 years ago

4 0

The triangle has to equal to 180. So add them up and equal it to 180

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Evaluate 3 – 5 · 2 + 8 ÷ 4 – 2 using the correct order of operations.

soldi70 [24.7K]

The answer is
C) -7

Multiply -5 by 2
Divide 8 by 4 :
3-10+2-2
Subtract 10 from 3 :
-7+2-2
Add -7 and 2 :
-5 - 2
Subtract 2 from -5:
-7

3 0

3 years ago

Please help!! MathsWatch, Surd Expressions, Clip 207c

dexar [7]

Answer:

$A=(72+36\sqrt{3})\ mm^2$

Step-by-step explanation:

see the attached figure with letters to better understand the problem

Let

a ----> the height of rectangle in mm

b ---> the base of rectangle in mm

step 1

Find the base of rectangle

$b=AB+BC+CD+DE$ ----> by segment addition postulate

substitute

$b=3+3+3+3=12\ mm$

step 2

Find the height of rectangle

$a=FB+CG+GH$ ---> by segment addition postulate

substitute the given values

$a=3+CG+3\\a=6+CG$

Find the length sides CG

Applying the Pythagorean Theorem

$BG^2=BC^2+CG^2$

substitute the given values

$6^2=3^2+CG^2$

$CG^2=6^2-3^2$

$CG=\sqrt{27}\ mm$

simplify

$CG=3\sqrt{3}\ mm$

therefore

$a=(6+3\sqrt{3})\ mm$

step 3

Find the area of rectangle

$A=ab$

we have

$a=(6+3\sqrt{3})\ mm$

$b=12\ mm$

substitute

$A=(6+3\sqrt{3})(12)=(72+36\sqrt{3})\ mm^2$

8 0

3 years ago

Someone plz help me

Paul [167]

Answer:

keegan is correct

the answer is B

8 0

3 years ago

What is the value of x in the equation-2/5x-2=18

Flura [38]

First we have to isolate the varible

-2/5x-2=18
+2 +2

-2/5x=20

then divide both sides by -2/5 to get x completely by itself

-2/5x=20
------- ---
-2/5 -2/5

x=-50

i hope i've helped!

5 0

3 years ago

Read 2 more answers

If measure angle acd=70 then measure angle bcd=

FinnZ [79.3K]

Answer: 35

Step-by-step explanation:

Angle ACD = 70

Angle BCD = 70/2 = 35

8 0

2 years ago