Solve for x.
1. 6x - 3x = 12
2. 3x - 5 = x + 3
3. 1/2x + 1/5x = 14
4. 2.5x +1.0x = 7

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

Evaluate 8j -k+148j−k+14 when j=0.25j=0.25 and k=1k=1.

Which expression is equivalent to 16 in exponential form? a) 4 × 4 b) 8 × 2 c) 23 d) 24