I need to know how to write an equation whose solution is x=3.5 but i don't know how

John collected 150 nickels and dimes. He has 30 more nickels than dimes. How many of each does he have

If the third term in a geometric sequence is 20, and the fifth term in the sequence is 5, what is the ratio (multiplier) ?

The equation for a circle is x2-8x+y2-2y-8=0 . What is the equation of the circle in standard form?

How to round to the nearest cent

Translate sentence into an equation. 20 subtracted from three times a number is 6 more than the number

He uses 6 inches of yarn per bracelet. how many bracelets can sal make with 5 feet of yarn?

If the remainder on division of x^3+2x^2+kx+3 by x-3 is 21, find the quotient and the value of k. Hence, find the zeroes of the cubic polynomial x^3+2x^2+kx-18.

What is - 2, 0, 1.7, - 5/2 in order from least to greatest?

Four multiplied by the some number equals 32

Joe and grace are baking cookies they need a total of 2 cups of sugar for the recipe joe has 11/10 cups of sugar and grace has 3/4 of a cup of sugar without solving the problem do they have enough sugar explain your thinking