Help! This is a 45 45 90 triangle

The 2nd one

Step-by-step explanation:

The ratio of the sides of 45-45-90 triangles is a:a:a. 9 would be the side that is equal to a, so to find what a is you have to do 9 divided by . The way you do this is make it the fraction and multiply that by so you would get , which is the second one

3.4 pizzas

step-by-step explanation:

given is a scatter plot showing number of pizzas sold during weeks for different issues of coupon

y represents number of pizzas sold and x number of coupons issued

y is marked verticaly and x horizontally

the trend line is given as

y =3.4x+43

this says that even when no coupon is issued pizzas sold will be 43

and rate of change of pizza sold for 1 unit of coupon = slope = 3.4

i.e. when x increases by 1 unit y increases by 3.4 units

hence for each additional coupon issued 3.4 pizzas more will be sold

1/4 because there is 4 grades.