Lucia knows 2×5 but doesn't know 2×7. how could sonia use 2×5 to find 2×7?

Which answer is it for it to be simplified completely?

Dee used 2 1/3 cups of sugar for a cake recipe. if the amount of sugar the container holds is 3 times the amount she used, does the container hold more than, less than, or equal to 3 cups of sugar? explain.

Find the value of p for which the polynomial 3x^3 -x^2 + px +1 is exactly divisible by x-1, hence factorise the polynomial