Kelvin has 112 stamps in all. the ratio of the number of local stamps to the number of foreign stamps is 7: 9. how many more foreign stamps than local stamps does kelvin have?

The diagram shows a 7cm by 6cm rectangle based pyramid. all the diagonal sides - ta, tb, tc and td are length 10cm. m is midpoint of rectangular base. work out height mt to 1 decimal place

What is the standard form of -5x^2+2x^4-11+x^3+3x

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11