Only number 7. . i start school tomorrow

y = x² + 1

Step-by-step explanation:

Consider the differences in the y values

y : 1  2  5   10  17

      1   3   5   7 ← first differences are not constant so not linear

Consider the differences of the first differences

1   3   5   7

  2  2   2← second differences are constant

Because the second differences are constant the relationship is quadratic

The form of the relationship is

y = x² ± c ← where c is a constant

Substitute values of x into the relationship to find what is needed

x = 0 : y = 0² = 0 ← require to add 1 to obtain 1

x = 1 : y = 1² = 1 ← require to add 1 to obtain 2

x = 2 : y = 2² = 4 ← require to add 1 to obtain 5

x = 3 : y = 3² = 9 ← require to add 1 to obtain 10

x = 4 : y = 4² = 16 ← require to add 1 to obtain 17

Hence relationship is y = x² + 1

x = central angle apc = measure of minor arc ac

the two angles x and 30 add to 180, so x+30 = 180 and x = 180-30 = 150. the measure of minor arc ac is 150 degrees.

what we need to do from here is find the circumference and then multiply it by x/360 since there are 360 degrees in a circle. in this case, x = 150, so x/360 = 150/360 = 15/36 = 5/12. the shortest distance along the curve from a to c is 5/12 of the distance around the entire circle (aka circumference)

c = circumference

c = pi*d

c = pi*24

c = 24pi

now multiply this by 5/12 to get

distance along minor arc ac = (5/12)*(circumference)

distance along minor arc ac = (5/12)*(24pi)

distance along minor arc ac = 10pi

the formula you can use is

l = (x/360)*pi*d

with

l = length of minor arc

x = central angle

d = diameter

which essentially is the steps we took though a bit differently.

e.

step-by-step explanation:

because there are always 10 numbers in a phone number.