Answer:
D. 8
Step-by-step explanation:
y varies jointly as x and z
y = k(xz)
-------------------------
Find k, the constant of variation
y = 12 when x = -2 and z=3
12 = k(-2 * 3)
12 = k(-6)
k = -2
-------------------------
find y when x is 4 and z is -1
using k = -2
y = -2(4 * -1)
y = -2(-4)
y = 8
A= bh divide by 2 so you'll multiply 10x8 the product would be 80 and so you divide 80 by 2 and get 40 as your result.
Answer: 5x2-2x-7
Step-by-step explanation:
(4x2 + 3x - 1) + (x2 - 5x - 6)
=4x2+3x-1+x2-5x-6
=5x2-2x-7
Answer: d. 
Step-by-step explanation:
Let the number of ounces of clay that Elisa uses to make one vase of either size denotes by 'c'
Given : To make a small vase, Elisa uses no more than 4.5 ounces of clay.
i.e. 
Also, To make a large vase, she uses at least 12 ounces of clay.
i.e. 
Then , the compound inequality represents the number of ounces of clay that Elisa uses to make one vase of either size will be :-

Answer:

Step-by-step explanation:
Theoretically, there is not square root of neither 13 nor a negative number so the special symbol is used to represent the square root of a number.