Answer:
Xavier has 5 dollars
Step-by-step explanation:
2x represents how much money Alex had, the -3 is how much he spent, and the 7 is how much he has now

Add 3 to both sides

divide both sides by 2

Checking my work:

In an arithmetic sequence d represent the common difference.
The formula to find the general term of an arithmetic sequence is,

Where
= nth term and
= First term.
Given,
. Therefore,


Next step is to subtract the above equations so that we can eliminate a1 and get the value of d. Hence,
4d - 8d = 24 - 40
-4d = - 16
Divide each sides by - 16.
d = 4
So, d = 4.
Hope this helps yoi!.
Answer:
The approximate mass of the brain of a mouse is 2 grams
Step-by-step explanation:
The correct question in the attached figure
Let
B -----> the approximate mass B of the brain in grams
m ----> the mass of a mammal's brain in grams
we know that
----> given problem
we have

substitute in the formula above

Remember that
![(64)^{\frac{2}{3}}=\sqrt[3]{(64)^2}=\sqrt[3]{(4^{3})^2}=\sqrt[3]{(4^{6})}=4^{2}=16](https://tex.z-dn.net/?f=%2864%29%5E%7B%5Cfrac%7B2%7D%7B3%7D%7D%3D%5Csqrt%5B3%5D%7B%2864%29%5E2%7D%3D%5Csqrt%5B3%5D%7B%284%5E%7B3%7D%29%5E2%7D%3D%5Csqrt%5B3%5D%7B%284%5E%7B6%7D%29%7D%3D4%5E%7B2%7D%3D16)

A. 8 x 10^ -4
D. 3 x 10^ -2