PLEASE HELP I WILL GIVE U BRAINLIEST FOR BOTH QUESTIONS

Find the value of the cosine for angle a

You are making a blueprint of your bedroom and you plan to use a scale factor of 18 . the actual width of your room is 14 feet and the actual length of your room is 16 feet. determine the width and length of your room on the blueprint. on the blueprint, your room will have a width of feet and a length of feet.

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.