Answer:
1. 2x+5
2. 20x-8y
3.2a+2b+3b+sqrt(2)
Step-by-step explanation:
1. 2/5x+1 is one side, and it's a regular pentagon, so it's 5(2/5x+1). 5(2/5x+1)=2x+5, so the perimeter is 2x+5.
2.due to all the angles of the cross the same, they must be right angles, and because of this, we can assume that the cross can be made a square with the same length and width, and that the extra part is equivalent to the sides, so we can do 8(5/2x-y). 8(5/2x-y)=20x-8y, which means 20x-8y is the answer.
3. due to the congruent sides, we know this right triangle is a 45 45 90 triangle, which means we know that the hypotenuse of triangle a is 3b/2, and furthermore triangle a is also a 45 45 90 triangle so its legs are (3b/2)*sqrt(2). when adding all the sides together, we get 2((2a-b)/2)+2(3b/2)+2(3b/2*sqrt(2)) =2a-b+3b+3b*sqrt(2)=2a+2b+3b+sqrt(2), thus the answer is 2a+2b+3b+sqrt(2).
This is a simple equation that is easily solved.
2x-4=6 You just have to isolate the variable, which is x, to get the solution.
So what you can do, is to get rid of the -4 to isolate the variable by adding 4 to the other side of the equation.
2x-4 (+4)=6+4
2x=10
Then you can isolate the variable by doing the opposite action it says to do, so division.
x=5
Well if you want a why it is because that is the formula for a parallelogram but the answer is... well idk you need to add the height too not just the base :3
In the first 100 pages there are 10 pages with numbers 40-49 ( that is total of 11 4's) and another 4 in the units, 10's , 20's, .... 90's ( not including 40's) That is total of 9 4's.
So in first 100 pages there are 20 4's.
therefore there are 20 4's on pages 101-200 and another 20 4's on pages 201-300.
On pages 301 to 352 there are 15 4's.
answer is 3*20 + 15 = 75.
sory i dont now spanish but try this
m athway
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quickmath
