1. After Barnaby turns on his laptop computer in a coffee shop, the computer's battery begins
losing power at a constant rate. The battery
was 40% charged after 2 hours and
10% charged after 3.5 hours. If x is the
number of hours since Barnaby turned on the
computer, and y is the percentage of battery
power remaining, which function models this
situation?
A. y = -0.3x + 0.6
C. y = -0.2x + 0.6
B. y = -0.3x + 0.8 D. y = -0.2x + 0.8
=

idkit the do u know da way and ligma consumed ninja

step-by-step explanation:

answer: what are the following choices

hello!

to begin with, we're given that on earth, a rock weighs 20 pounds, and while on jupiter, that same rock weighs 42 pounds. now, we're trying to find the weight of a rock that weighs 10.5 pounds on earth, on jupiter.

to solve this, first, set up a proportion, cross-multiply, and solve it algebraically.

setting up the proportion is the hardest and the most confusing part of the problem, but it's simple.

if on earth, the rock weighs 20 lbs, and on jupiter it weighs 42 lbs, our first part of our proportion is 20/42 lbs. the second part has to be equal to each other. this means that 10.5 has to be on the numerator of the fraction, and x, the value we're trying to find, has to be on the denominator. remember that the rock weighs 10.5 lbs on earth, and we're trying to find the weight of it on jupiter (which is x).

20/42 = 10.5/x

next, you would cross-multiply.

20x = 42(10.5)

20x = 441

now, solve it algebraically by using division.

x = 22.05 lbs

this can be rounded to 22.1 lbs.

therefore, the weight of the rock on jupiter is 22.1 lbs, the fourth choice.

-3.5 degrees per hour

step-by-step explanation:

find the unit rate:

-12   1/4 degrees           12.25 degrees

= - = -3.5 degrees per hour

      3   1/2 hours               3.5 hours