Please can you help I’m so stuck

So as far as my knowledge goes, your answer for (a) is right - it is a cylinder.

(b) is a triangular pyramid - this is because the base is a triangle ( aka the one in the middle) and there are three triangles surrounding it and when they come together, they form a triangular pyramid.

hope it helped, if it did, please make me the brainliest answer - I need to move on to the next level :)

infinitely many solutions

step-by-step explanation:

we have been given the equation;

2(2x + 3) = -4 + 2(2x + 5)

we need to determine the value of x.

2(2x + 3), we expand this expression to obtain 4x + 6

similarly 2(2x + 5) will become 4x + 10

now we have;

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 10 - 4

4x + 6 = 4x + 6

the expression on the left hand side is identical to the one on the right hand side. therefore, we are looking at just a single straight line whose equation is;

y = 4x + 6

consequently, we shall have infinitely many solutions