Answer:
x=8.4
Step-by-step explanation:
4x +8y=40
replace y as 0.8
4x+8*0.8=40
4x+6.4=40
subtract 6.4 from both sides
4x=33.6
divide by 4
x=8.4
Answer:
A = 210 cm²
Step-by-step explanation:
Perimeter of the triangle = the sum of the sides of the triangle.
70 = (3x - 1) + (4x + 1) + (3x)
70 = 10x
7 = x The length of the sides of the triangle are 3x - 1 = 20; 4x + 1 = 29 and
3x = 21.
Looking at the given information, this triangle is a special type of triangle because the area of a triangle is Area = 1/2 bh and you do not know which side is the base and height of the triangle.
Trying a² + b² = c² to see if it is a right triangle. 20² + 21² = 29 ² ; yes it is a right triangle and now we know that the base and height is 20 and 21. The longest side is the hypotenuse in a right triangle
A = 1/2bh
A = 1/2 (20)(21)
A = 10 · 21
A = 210 cm²
9514 1404 393
Answer:
x = 5
Step-by-step explanation:
In order to obtain a solution, we must assume that the figure is a parallelogram.
Angle BED will be congruent to angle BCD. The sum of angles in triangle BED is 180°, so we have ...
55° +51° +(14x +4)° = 180°
14x = 70 . . . . . . divide by °, subtract 110
x = 5 . . . . . . . . . divide by 14
The original class had 32 students. 25% of 32 is 8 and 32+8=40
Answer:
D
Step-by-step explanation:
