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Dahasolnce [82]
3 years ago
13

What is the equation of a line that is perpendicular to - x + 2y = 4 and passes through the point (-2,1)

Mathematics
1 answer:
Damm [24]3 years ago
3 0
Perpendicular has slope that multiplies to -1

the slope for ax+by=c is -a/b
-1x+2y=4
slope=-(-1)/2=1/2
1/2 times what=-1?
-2

y=mx+b
m=slope
we need slope is -2
y=-2x+b
find b
given
(-2,1)
(x,y)
x=-2 and y=1 is a solution

1=-2(-2)+b
1=4+b
mius 4 both sides
-3=b


y=-2x-3 is equation

first one
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Help anyone can help me do this question,I will mark brainlest.​
FrozenT [24]

Answer:

3) 16π cm²

4) 240.625 cm²

Step-by-step explanation:

<em>3. For this problem I'm going to use the formula Area = π × r²</em>

<em>To start off, I'm going to input our value of radius which is 4cm.</em>

π × 4²

<em>Finally, I'm going to square our value "4"</em>

16π cm²

<em>(I'm going to "leave my answer in terms of π" as the problem states but if you need the complete answer it would be </em>about 50.24 cm²

<em>4. For this problem I'm going to use the formula Area = π × (d/2)²</em>

<em>To begin, I will divide our diameter by 2 to find the radius.</em>

17.5/2 = 8.75

<em>Next, we are going to square our now, radius.</em>

8.75² = 76.5625

<em>Now, we have to multiply our squared radius by π (in this problem it states to use 22/7, so that's what we'll do :)</em>

76.5625 × 22/7 = 240.625 cm²

<em>So! This is our final answer!</em>

<em />

Hope this Helps! :)

<em>Have any questions? Ask below in the comments and I will try my best to answer. </em>

-SGO

3 0
3 years ago
Albie's total income is $695.25 in a week
ikadub [295]

Answer:

Step-by-step explanation:

7.5/100= .075

$580000 x .075 = $43,500 commission

5 0
3 years ago
Leonel runs on different trails near his home for exercise. uses of positioning device to record how far from home he is when he
anygoal [31]

Answer:

F

Step-by-step explanation:

bipb asfjsdhjkdshfjsdkhjfjhkdfssjfdjdfjkdfjdfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffsssssssssssssssssssefffffffffffffffllllllllllllllllllllllllllllllllllllllllllll mmmmmmmm;fsaeeeeeeeeeeeeeeeeeeeeeeeeeeeejragk b;;;;;;;;;;;;;;;;;;;jr bgakgbrrrrrrrradjl abrgjll abgrkakgbjrkbagjr gbjrjlkfda v .vvvvvvvvvvvvvvvvvvvf

3 0
3 years ago
what is the equation for “the product of a number and 3 is 5 less than the quotient of a number and 4
marishachu [46]
Equation 1.
20÷4=5
0×3=0
5-5=0
Equation 2.
44÷4=11
2×3=6
11-5=6
Equation 3.
56÷4=14
3×3=9
14-5=9
5 0
3 years ago
The mean age of 5 people in a room is 28 years.
lina2011 [118]

Answer:

174

Step-by-step explanation:

You should look at the mean and do this:

5*28 so now you know all the ages which is 140 now you do 140/29 and you get 4.8....... so you  can see that the answer is 174

4 0
3 years ago
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