Okay what you wanna do it multiple 4.2 and 3.9. if it says "by" it means multiple
This is an incomplete question, here is a complete question.
A hurricane wind blows across a 7.00 m × 12.0 m flat roof at a speed of 150 km/h.
What is the pressure difference Δp = p(inside)-p(outside)? Use 1.28 kg/m³ for the density of air. Treat the air as an ideal fluid obeying Bernoulli's equation.
Answer : The pressure difference will be, 
Step-by-step explanation :
As we are given:
Speed = 150 km/h = 41.66 m/s
Density = 
Area = A = 7.00 m × 12.0 m
Formula used :

Now put all the given values in this formula, we get:


Thus, the pressure difference will be, 
Answer:
In mathematics, a set of simultaneous equations, also known as a system of equations or an equation system, is a finite set of equations for which common solutions are sought. An equation system is usually classified in the same manner as single equations, namely as a: ... System of difference equations
please give brainliest
Answer:
12
Step-by-step explanation:
The most important factor is the total budget $1334.50, for the softball tournament.
1. Subtract $779.50 from $1334.50 = $555
2. We have $555 left, and a budget of $46.25 per player for meals
3. Divide 555/46.25 = 12
4. 12 softball players can be brought to the tournament
21 would be ur answer
69+21=90