Answer:
Step-by-step explanation:
Answer:
b. 7+21
Step-by-step explanation:
If you do 1+3=4 and then 4 times 7 that equals 28. When you do 7+21 that equals 28 too. So b is the answer
Answer: the answer is d pls give brainlEst
Step-by-step explanation:im sorry i guess my math was wronge
90-x because a complementary angle is =90 degrees.