The surface area is 870 cm².
Since the base is a regular quadrilateral, each side is the same; dividing the perimeter by 4 will give us the side length:
60/4 = 15
To find the area, we square the side length:
15² = 225
There are two bases, so the area of these is 2(225) = 450
There are 4 lateral faces, so the lateral area is 4(105) = 420
Together, this gives us a total surface area of 870.
Answer:
x=9
Step-by-step explanation:
90(the angle)-30=60
60-15=45
45/5=9
<u>(5(9)+15)+30=90</u>
Answer:
his average speed is 12 2/3 kilometers per hour.
Step-by-step explanation:
Answer:
<h3>

</h3>
Step-by-step explanation:

Move 5x to left hand side and change it's sign
⇒
Move 3 to right hand side and change it's sign
⇒
Collect like terms
⇒
Subtract 3 from 21
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Divide both sides of the equation by -6
⇒
Calculate
⇒
Hope I helped!
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1. 4i x -10i = -40ii
ii = i^2 = -1
-40*-1 = 40
2. -6-9 = -15
5i- - 5i = 5i + 5i = 10i
answer = -15 +10i
3. raise both sides to the 3rd, and solve for x. x = -12
4. the equation would be x^2+36 =0