Alex bought some crayon pens and sketch pens in the ratio of 7:4. Each crayon pen cost $2.

Each sketch pen cost $2 more than each crayon pen.

He spent a total of $360 on these crayon pens and sketch pens.

How much did he spend on the crayon pens he bought?

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Find the values of y: 3y^3(y^2+ 2/3y)=0

How many grams the dog will eat in 3 days?