What is 4 + 5 in decimal form

9

Step-by-step explanation:

We know that 2+5=7 so add 2 and that equals 9

m∠a is 90°

m∠b is 40°

yes

step-by-step explanation:

so of course you want to start by plugging the 5 in which goes to 7(5)+3(5)=50 because 7*5=35 and 3*5=15 and then add them together, then plug in the 5 to the other equation as well 9(5)+5=50 because 9*5= 45 and then add 5 and so yes they are equivalent.