It looks like it is 14 sit ups per day. Image is kind of too small to make it out perfectly.
Answer:

Step-by-step explanation:
The figure shows a right triangle.
To calculate the measure of the angle A, you can use the inverse trigonometric function arctangent:

Identify the angle
, the opposite side and the adjacent side:

Substitute into
.
The measure of the angle A is:

Rounded to the nerarest hundreth:

Answer: 
Step-by-step explanation:
Let be "x" the price per pound for grapefruit, "y" the price per pound for oranges.
We know that Steve buys 2 pounds of grapefruit and 3 of oranges for $7.20.
This means that the sum of the products of
and
is $7.20. Then, we can write this equation to represent it:
Kennedy buys 4 pounds of grapefruit and 2 pounds of oranges for $8.80.
This means that the sum of the products of
and
is $8.80. Then, we can write this equation to represent this:
Therefore, we get that the system of equations that models the situation is:

Convert everything to kg first
12g = 0.012kg
2500mg = 0.0025kg
0.23 tonnes = 230kg
so
2500mg, 12g, 0.23 tonnes, 4600kg