1)if y =x^2 +2x fins the value of y when x=1 2) estimate the answer to 7.9x0.67 3)to decrease an amazing by 4% what single multiplier would u use 4) if the relative frequency of a train being late is 0.15, how often could u expect the train to be late in 100 days pls do any of the questions 10 points

1) plug in 1 for x to get the following:

1^2 + 2(1)
1^2 = 1
2 * 1 = 2
1 + 2 = 3

the answer is 3.

2) for estimating, your teacher may have another method but here's how i was taught:

determine whether to round up or down to a whole number:
7.9 rounds up to 8 and 0.67 rounds up to 1, and 8 * 1 is 8, so i would estimate the answer to be 8.

(i can't do the remaining two sorry!!)