The difference of a number times 7 and 5 is 8 . use the variable x for the unknown number

Ineed with number 6 , explain how to get 1978

Heather is riding a quadratic function that represents a parabola that touches but does not cross the x-axis at x=-6

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!