Yes，y＝2x＋7 is a function
because x is argument，and it has x and y，it is a primary function
Answer:
27
Step-by-step explanation:
3x + 9 = 90
3x = 81
x = 27
Answer:
√
42 lies between 6 and 7
Step-by-step explanation:
We know that √
42 will lie between √
36 and √
49
And √
36
=
6 ; √
49
=
7
Hence we can be sure that √
42 lies between 6 and 7
13.1
Explanation
5.9+7.2=13.1
