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sp2606 [1]
3 years ago
13

Please help with these 3

Mathematics
1 answer:
Margaret [11]3 years ago
7 0
I only know number 9
9. 9x+38
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Don't know how to solve this problem, help would be appreciated
kenny6666 [7]

Answer:

219

Step-by-step explanation:

The figure has the shape of a trapezoid. We find the area of the trapezoid and subtract the area of the rectangular door.

area of trapezoid = (base1 + base2)h/2

area of trapezoid = (20 ft + 12 ft) * 15 ft / 2

area of trapezoid = 32 ft * 15 ft /2

area of trapezoid = 240 ft^2

area of rectangle = length * width

area of rectangle = 7 ft * 3 ft

area of rectangle = 21 ft^2

area to be painted = area of trapezoid - area of rectangle

area to be painted = 240 ft^2 - 21 ft^2

area to be painted = 219 ft^2

Answer: 219 ft^2

6 0
3 years ago
PLEASE HELP which of the following identities? Check all that apply
alisha [4.7K]
\sin(x - \pi) = \sin(x) \cos(\pi) - sin(\pi) \cos(x)
via the angle sum formula of sin
since \: cos(\pi) = - 1 \: and \: sin(\pi) = 0 \: then \\ sin(x - \pi) = - sin(x) \: which \: proves \: the \: first \: choice

\cos(x + y) + cos(x - y) = 2 \cos(x) \cos(y) =\:cos(x + y) + cos(x - y)=cos(x) cos(y)-sin(x)sin(y) +cos(x)cos(y)+sin(x)sin(y)=2cos(x)cos(y)
which proves the second choice
the third choice is wrong since for x=0,y=0 it will show that 2=1 which is incorrect
for the fourth one you can do some thing similar to choice one just expand the sum formula of sin and that should be true too
so
the first , the second and the fourth are all true
5 0
3 years ago
Read 2 more answers
Solve the simultaneous equation<br>x2+y2= 26<br>X - Y = 4<br>​
gayaneshka [121]
The answer is X=1, y=5. X=-5 y=-1
5 0
3 years ago
in a typical wimbledon,42,000 balls are used and 650 matches are played.about how many balls are used per match
Elina [12.6K]
About 65 balls per match
3 0
3 years ago
Read 2 more answers
Enter the equation in y=mx form to find the m as the slope​
Morgarella [4.7K]

Answer:

4

Step-by-step explanation:

look at the points that are intersected by the line. the first one is (2,8). put it in as Rise/Run to find the slope. you "rise" 8, and "run" 2

so 8/2 is the slope.

usually you need to simplify it.

8/2 = 4

4 0
3 years ago
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