4 a) Simplify: (i) 5x - 6y - x + 3y (ii) w^8 + w^2 (iii) 5c^2d × 3c (b) Work out the value of (i) 4x - 7 when x = 5, (ii) \frac{p + 7}{3} when p = 2. - OCR - GCSE Maths - Question 4 - 2018 - Paper 1

Since there are no like terms to combine, we present the result as:

$w^8 + w^2$

To simplify the expression, multiply the coefficients and combine the variables using the properties of exponents:

1. Coefficients: $5 × 3 = 15$
2. Variables: $c^2 × c = c^{2+1} = c^3$

Thus, the simplified expression is:

$15c^3d$

Substituting $x = 5$ into the expression:

$4(5) - 7 = 20 - 7 = 13$

Substituting $p = 2$ into the expression:

$\frac{2 + 7}{3} = \frac{9}{3} = 3$