49
Because 7x7 is 49 & 4+9=13
<span>Since charged particles cannot move across the membrane easily due to them being hydrophobic, they require a transport protein that expends energy in the form of ATP. ATP attaches onto the transport protein which changes the shape of the protein allowing ions to flow in, and it leaves a phosphate group turning into ADP.When the molecule has crossed the membrane, the phosphate group is detached from the protein.</span>
The factors of the expression are 
<h3>How to find factors in the expression?</h3>
First group the first two terms and the last two terms together respectively.
The factors of the expression are given by;
Hence, the factors of the expression are .
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brainly.com/question/9645056
10 yards because a square has 4 sides and all four sides are equal and so 40 divided by 4 equals 10
