ONE MOR TIME SINCE THESE BOTS KEEP GIVING ME SCAM LINKS. I'm Looking for the sum of all the answers, also need to round the neatest tenth. I got 11 but somehow it was wrong. Pls help quickly

A50% increase followed by 33 1/2% decrease

Solve the equation.then check your solution 8=1.88+a

Solve these problems: 1.what is the perimeter of an equilateral triangle with sides measuring 6cm? 2. a regular pentagon has sides measuring 3.2 cm. what is its perimeter? 3. a regular decagon has sides of 3.5mm . what is it’s perimeter? 4. a regular octagon has a perimeter of 64cm. what is the length of one of the sides? 5. a regular hexagon has a perimeter of 72mm . what is the length of one of the sides? 6. what is the perimeter of a rhombus with sides measuring 11m?