Please. Someone help me 4. The sequence of calculation
a) 3+ 4-7
b) 7 * 36 = 252
c) 252 - 5 = 247
can be replaced by
(3+4) 36-5-247.
By proceeding as above, express each
sequence of operations by one equality:
a) 3 + 8 = 11 : 11* 10 = 110
b) 3X 6 = 18 : 18x 40 = 720
c) 4x 80 = 320 : 320 - 12 = 308 :
308 + 34 = 342
d) 5x 70 = 350 ; 40 + 12 = 52 ;
350 - 52 = 298​

............ Could you tell me the name of your maths book?

pentagon

step-by-step explanation:

the coordinates   a(5, -2), b(3,-1),c(-4,-4) d(-3,8) and e(-1,4) forms the vertices of the polygon when they are connected in order.

in order to classify that which polygon is it with the given coordinates, first count the number of vertices and then count the number of sides it can make with these vertices.

since, the given coordinates have five vertices, therefore, it will make five sides. moreover, pentagon is regular in nature therefore it will be convex.

now, a polygon with five sides is known as pentagon, therefore, the given polygon is the pentagon.

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x