(5x+x^4) - (3x^4+4x)
pls help i dont know how to do it with the minus in the middle

Ascale drawing of a lake has a scale of 1 cm to 80 m. if the actual width of the lake is 1000 m what is the width of the lake on the scale drawing

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?

Write the pair of fractions as a pair of fractions with a common denominator