Answer:
a=-27
Step-by-step explanation:
⅓a-6=-15
multiply by 3 on both sides
3(⅓a-6)=3(-15)
a-18=-45
add 18 on both sides
a=-45+18
a=-27
A =a+b/2 *h
A =6.5+2.5/2*1.7=7.65cm B.
The dlope-intercept form:
![y=mx+b](https://tex.z-dn.net/?f=y%3Dmx%2Bb)
m - slope
b - y-intercept (0, b)
The formula of a slope:
![m=\dfrac{y_2-y_1}{x_2-x_1}](https://tex.z-dn.net/?f=m%3D%5Cdfrac%7By_2-y_1%7D%7Bx_2-x_1%7D)
We have two points from the graph
x-intercept: (-1, 0)
y-intercept: (0, - 1) → b = -1
Substitute to the formula of a slope:
![m=\dfrac{-1-0}{0-(-1)}=\dfrac{-1}{1}=-1](https://tex.z-dn.net/?f=m%3D%5Cdfrac%7B-1-0%7D%7B0-%28-1%29%7D%3D%5Cdfrac%7B-1%7D%7B1%7D%3D-1)
<h3>Answer: y = -1x - 1 = -x - 1</h3>
Answer:
<h3>(3y2+5y-7)+2(y3-4y2+5)</h3>
3y2+5y-7+2y3-8y2+10
3y2-8y2+5y-7+10
-5y2+5y+17