1). fifteen equals three more than six times a number. 2). thirteen is 7 more than one-fifth of a number.

3). eight less than three times a number is -23

MAKE THESE INTO AN EQUATION QUICK

Step-by-step explanation:

1.) here,

let the number be x

=》15 = 6x + 3

=》6x = 15 - 3

=》x = 12 ÷ 6

=》x = 2

hence, the number is 2

2.) let the number be y

=》

=》

=》

=》

hence,the number is 30

3.) let the number be z

=》3z - 8 = -23

=》3z = -23 + 8

=》z = -15 ÷ 3

=》z = -5

hence, the number is -5

your answer is 228

step-by-step explanation:

add the top and bottom bases together, then divide them by 2, then multiply by the height.